参考书目仅适用于一些链接

Question

您的问题是，您的一些 URL 被_使用了。如果您检查日志文件中收到的错误消息，就会发现这一点（missing $ inserted因为_在数学模式中被使用来指示索引写入...）。

您可以通过调用 package url（或 package hyperref）来避免此错误。

使用以下 MWE

\RequirePackage{filecontents}
\begin{filecontents}{\jobname.bib}
@Book{buhring,
  title         = {Praxislehrbuch Heilpflanzenkunde},
  publisher     = {Stuttgart: Hautg},
  year          = {2014},
  author        = {Bühring, Ursel},
  __markedentry = {[Felix:]},
}

@Electronic{Hildegard1,
  month = {27 } # apr,
  year  = {2017},
  url   = {https://www.heilpflanzenkatalog.net/heilpflanzen/heilpflanzen-europa/181-birke.html},
}

@Electronic{hildegardvonbingenwiki,
  month = {27 } # mar,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Hildegard_von_Bingen},
}

@Electronic{erziehungskunste,
  month  = {27 } # mar,
  year   = {2017},
  url    = {http://www.erziehungskunst.de/fileadmin/archiv_alt/2006/0106p003Scheffler.pdf},
  number = {50},
}

@Electronic{wikibetulin,
  month = {27 } # mar,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Betulin},
}

@Electronic{leukozyt,
  month = {27} # apr,
  year  = {2017},
  url   = {http://www.leukozyten-info.de/zytokine.html},
}

@Electronic{wundh,
  month = {27} # apr,
  year  = {2017},
  url   = {https://www.draco.de/wunden/wundratgeber/wundheilungsphasen},
}

@Electronic{pflanzenforschung,
  month = {27} # apr,
  year  = {2017},
  url   = {http://www.pflanzenforschung.de/de/journal/journalbeitrage/birken-wirken-forscher-untersuchen-die-heilende-wirkung-10197},
}

@Electronic{hydrophobe,
  month = {27} # apr,
  year  = {2017},
  url   = {https://www.deutsche-apotheker-zeitung.de/daz-az/2010/daz-13-2010/betuline-multifunktionale-aktivsubstanzen},
}

@Electronic{leipzigunic,
  month = {27} # apr,
  year  = {2017},
  url   = {http://research.uni-leipzig.de/giannis/Lehre/OCF/Naturstoffe/Betulin%20aus%20Birkenrinde.pdf},
}

@Electronic{betulingooglebookse,
  month = {27} # apr,
  year  = {2017},
  url   = {https://books.google.ch/books?id=vA8WAwAAQBAJ&pg=PA621&lpg=PA621&dq=Betulin+siedepunkt&source=bl&ots=0dDuhhTCrb&sig=gcCgvAW0u8D3RyvrpX6ds9w-4n4&hl=de&sa=X&ved=0ahUKEwif_K3Nl8TTAhXGRhQKHc2KDHYQ6AEILDAC#v=onepage&q=Betulin%20siedepunkt&f=false},
}

@Electronic{betulinleipzige,
  month = {27} # apr,
  year  = {2017},
  url   = {http://research.uni-leipzig.de/giannis/Lehre/OCF/Naturstoffe/Betulin%20aus%20Birkenrinde.pdf},
}

@Electronic{nhexanwikie,
  month = {31} # aug,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/N-Heptan},
}

@Electronic{Ethylacetatwikie,
  year = {2017},
  url  = {https://de.wikipedia.org/wiki/Essigs%C3%A4ureethylester},
}

@Electronic{unileipzige,
  year = {2017},
  url  = {http://research.uni-leipzig.de/giannis/Lehre/OCF/Naturstoffe/Betulin%20aus%20Birkenrinde.pdf},
}

@Electronic{mikrosub,
  month = {30} # apr,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Standardbedingungen},
}

@Electronic{pharao,
  month = {27} # feb,
  year  = {2017},
  url   = {https://www.wildfind.com/artikel/der-heilschatz-der-pharaonen},
}

@Electronic{eberswiki,
  month = feb,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Papyrus_Ebers},
}

@Electronic{multitalent,
  month = {27} # feb,
  year  = {2017},
  url   = {http://www.zeit.de/2002/09/Multitalent_aus_Weidenrinde},
}

@Electronic{alleskonner,
  month = {27} # feb,
  year  = {2017},
  url   = {http://www.natuerlich-online.ch/magazin/artikel/die-alleskoennerin/},
}

@Electronic{brenzcatechinwikia,
  month = {01} # jul,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Brenzcatechin},
}

@Electronic{veratrumsaurewikia,
  month = {01} # jul,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Veratrums%C3%A4ure},
}

@Electronic{weidemultitalent,
  month = {22} # apr,
  year  = {2017},
  url   = {http://www.zeit.de/2002/09/Multitalent_aus_Weidenrinde},
}

@Electronic{weidenextrakt,
  month = {22} # apr,
  year  = {2017},
  url   = {http://www.docjones.de/wirkstoffe/weide/weidenrinden-extrakt},
}

@Electronic{nina,
  month = {22} # apr,
  year  = {2017},
  url   = {http://docplayer.org/24114796-Laborbericht-aspirin-nina-menghini-bianca-theus-anna-senn.html},
}

@Electronic{mediconsult,
  month = {22} # apr,
  year  = {2017},
  url   = {http://www.medicoconsult.de/prostaglandine/},
}

@Electronic{cupaspirin,
  month = {24} # apr,
  year  = {2017},
  url   = {http://www.cup.lmu.de/didaktik/lehrer/materialien/aspirin/aspirin---},
}

@Electronic{salicinwiki,
  month = {24} # apr,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Salicin},
}

@Electronic{sonntagsz,
  month = {28} # feb,
  year  = {2017},
  url   = {http://info.sonntagszeitung.ch/archiv/detail/?newsid=236698},
}

@Article{quendi,
  author  = {Qëndresa Hoti},
  title   = {Maturaarbeit - Von der Weide zum Medikament},
  journal = {Missing},
  year    = {2014},
  note    = {S.09},
}

@Article{meike,
  author = {Meike Spiess},
  title  = {Salicylsäure aus Weidenrinde},
  year   = {2014},
  note   = {S.18},
}

@Electronic{awlheilpflanzen,
  month = {02} # jul,
  year  = {2017},
  url   = {http://www.awl.ch/heilpflanzen/betula_pendula/birke.htm},
}

@Electronic{Kresola,
  month = {02} # jul,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Kresole},
}

@Electronic{sonntag,
  month = {28} # feb,
  year  = {2017},
  url   = {http://info.sonntagszeitung.ch/archiv/detail/?newsid=236698},
}

@Electronic{loewe,
  month = {28} # feb,
  year  = {2017},
  url   = {http://www.loewenapotheke-weener.de/aktuelles/birkenkorkenextrakt/},
}

@Electronic{zeitungde,
  month = {28} # feb,
  year  = {2017},
  url   = {http://www.pharmazeutische-zeitung.de/index.php?id=41439},
}

@Electronic{koop,
  month = {28} # feb,
  year  = {2017},
  url   = {http://www.koop-phyto.org/arzneipflanzenlexikon/birke.php 28.02.2017},
}

@Electronic{heilpf,
  month = {28} # feb,
  year  = {2017},
  url   = {http://www.awl.ch/heilpflanzen/betula_pendula/birke.htm},
}

@Electronic{europa,
  month = {28} # feb,
  year  = {2017},
  url   = {http://www.ema.europa.eu/docs/de_DE/document_library/EPAR_-_Product_Information/human/003938/WC500201153.pdf},
}

@Electronic{docplayer,
  month = {27} # feb,
  year  = {2017},
  url   = {http://docplayer.org/24114796-Laborbericht-aspirin-nina-menghini-bianca-theus-anna-senn.html},
}

@Electronic{schmelz,
  month = {27} # feb,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Schmelzpunkt},
}

@Electronic{chids,
  month = feb,
  year  = {2017},
  url   = {http://www.chids.de/dachs/praktikumsprotokolle/PP0096Nachweis_von_Salicylsaeure.pdf},
}

@Electronic{fecl,
  month = {27} # feb,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Eisenchloridtest},
}

@Electronic{eiscate,
  month = {27} # feb,
  year  = {2017},
  url   = {https://books.google.ch/books?id=zl3yCAAAQBAJ&pg=PA525&lpg=PA525&dq=Nachweis+Catechin&source=bl&ots=lY31deR_6l&sig=CGdvHE6gOHBmbKiQy3Ntf9DapMo&hl=de&sa=X&ved=0ahUKEwi-g9SC6__PAhVDOBQKHWXSBnwQ6AEIPDAC#v=onepage&q=Nachweis%20Catechin&f=false},
}

@Electronic{chidsala,
  month = {27} # feb,
  year  = {2017},
  url   = {http://www.chids.de/dachs/praktikumsprotokolle/PP0096Nachweis_von_Salicylsaeure.pdf},
}

@Electronic{googlebo,
  month = {27} # feb,
  year  = {2017},
  url   = {https://books.google.ch/books?id=85KiBwAAQBAJ&pg=PA187&lpg=PA187&dq=Triterpen+eisen+III+chlorid&source=bl&ots=hhIsO4xkX-&sig=sBM-QN54T0lCzMP9yRpZpA40sr8&hl=de&sa=X&ved=0ahUKEwjeuI_RlbDSAhXDVywKHdI6BNoQ6AEINDAC#v=onepage&q=Triterpen%20eisen%20III%20chlorid&f=false},
}

@Book{dtv,
  title     = {dtv-Atlas Chemie},
  publisher = {München: Dt. Taschenbuchverlag},
  year      = {2006},
  edition   = {Bd.1 Allgemeine und anorganische Chemie. -10., korr. u. aktual. Aufl.},
}

@Electronic{oxalis,
  month = {27} # feb,
  year  = {2017},
  url   = {http://www.oxalis-acetosella.com/duennschichtchromatographie.html},
}

@Electronic{chemieunter,
  month = {27} # feb,
  year  = {2017},
  url   = {http://www.chemieunterricht.de/dc2/citrone/hplc.htm},
}

@Electronic{patent,
  month = {17} # feb,
  year  = {2017},
  url   = {http://www.google.com/patents/EP0810222B1?cl=de},
}

@Electronic{urgeschmack,
  month = {18} # mar,
  year  = {2017},
  url   = {http://www.urgeschmack.de/was-sind-tannine/},
}

@Electronic{gerbstoffwiki,
  month = {24} # jul,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Gerbstoffe#Nat.C3.BCrliche_Gerbstoffe},
}

@Electronic{wein,
  month = {24} # jul,
  year  = {2017},
  url   = {https://www.delinat.com/gerbstoff.html},
}

@Electronic{roesten,
  month = {12} # mar,
  year  = {2017},
  url   = {http://onlinelibrary.wiley.com/doi/10.1002/food.19680120406/epdf?r3_referer=wol&tracking_action=preview_click&show_checkout=1&purchase_referrer=www.google.ch&purchase_site_license=LICENSE_DENIED},
}

@Electronic{zytokin,
  month = {27} # apr,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Zytokin},
}

@Electronic{nhexanwik,
  month = {27} # feb,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/N-Hexan},
}

@Electronic{vanillinwiki,
  month = {16} # aug,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Vanillin-HCl-F%C3%A4rbung},
}

@Electronic{saulewiki,
  month = {16} # aug,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/S%C3%A4ulenchromatographie},
}

@Electronic{test,
  month = {16} # feb,
  year  = {2017},
  url   = {http://www.erziehungskunst.de/fileadmin/archiv_alt/2006/0106p003Scheffler.pdf},
}

@Electronic{polyphenol,
  month = {4} # sep,
  year  = {2017},
  url   = {www.lci-koeln.de/polyphenole-raters-lotz-lemi-tag-2014},
}

@Electronic{catechin,
  month = {4} # sep,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Catechine},
}

@Electronic{homeocatechin,
  month = {21} # feb,
  year  = {2017},
  url   = {http://homoeopathie-naturheilkunde.vitanet.de/heilpflanzenlexikon/eiche},
}

@Electronic{chemieeisen,
  month = {4} # sep,
  year  = {2017},
  url   = {http://www.chemieunterricht.de/dc2/tip/05_15.htm},
}

@Electronic{druck,
  month = {04} # sep,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Siedepunkt},
}

@Electronic{flussig,
  month = {05} # sep,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Fl%C3%BCssig-Fl%C3%BCssig-Extraktion},
}

@Electronic{heptanwikipedia,
  month = {05} # sep,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/N-Heptan},
}

@Electronic{saligenin,
  month = {05} # sep,
  year  = {2017},
  url   = {https://de.wikipedia.org/wiki/Salicylalkohol},
}
\end{filecontents}


\documentclass[12pt, oneside]{article}
\bibliographystyle{IEEEtran}
\usepackage[super]{natbib}

\usepackage[hyphens]{url} % <===========================================
\usepackage{hyperref} % <===============================================

\begin{document}
\section{Test}
Text \cite{polyphenol} \\ \nocite{*} % <================================
Text \cite{wikibetulin}
\bibliography{\jobname}
\end{document}

您将获得以下结果，没有任何错误或警告（除了由于包filecontents在一个 MWE 中包含 bib 文件和 TeX 代码而导致的错误或警告）：

顺便说一句：我纠正了你第一个 bib 条目中的一个拼写错误：它Praxislehrbuch Heilpflanzenkunde应该是Praxislehrbuch Hilpflanzenkunde......

Answer 1