如何不丢失Bibtex文件中的特殊字符？

Question

我的 bibfile 包含特殊字符。当我使用 TexShop (4.70) 打开文件时（我曾在 Mac 上创建此文件），我可以看到我的特殊字符。当我使用 Texmaker (5.1.3) 打开文件时，我可以看到特殊字符后面跟着两个方框，而当我在 Texshop 中打开文件时，这两个方框并不存在。我如何才能在 Bib 文件中永久写入特殊字符，并确保其他人也可以读取和使用该文件？

例子

这是Texshop展示的内容

@jurisdiction{Tadiccontempt,
 title         = {Prosecutor v. Dusko Tadi{\'c}‡‡ a/k/a "Dule"},
 subtitle      = {},
 titleaddon    = {ICTY AC Judgement on Allegations of Contempt against Prior Counsel, Milan Vujin (31 January 2000)},
 date          = {},
 number  = {IT-94-1-A-R77},
 pages         = {},
 keywords = {ICTY}, tabulate={ICTY},
}

以下是 Texmakers 展示的内容：

@jurisdiction{Tadiccontempt,
 title         = {Prosecutor v. Dusko Tadi{\'c}**[here I see two boxes]** a/k/a "Dule"},
 subtitle      = {},
 titleaddon    = {ICTY AC Judgement on Allegations of Contempt against Prior Counsel, Milan Vujin (31 January 2000)},
 date          = {},
 number  = {IT-94-1-A-R77},
 pages         = {},
 keywords = {ICTY}, tabulate={ICTY},
}

PDF 未打印 Tadić 中的 ć。我该如何避免这两个框？