我需要插入基于哈佛参考文献样式标签的bibitem

Question

有人能帮助我吗？

FUNCTION {output.bibitem}
{ newline$
  "\bibitem" write$
  make.full.names duplicate$ label =
    'skip$
    { "{" label * "}" * write$ }
  if$
  "[" swap$ * "(" * write$
  year duplicate$ empty$
    { pop$ "????" }
    'skip$
  if$
  extra.label * ")]{" * write$
  cite$ write$
  "}" write$
  newline$
  ""
  before.all 'output.state :=
}

我需要的预期输出是：

\bibitem[Ashkin \harvardand{} Dziedzic(1987)]{ashkin_science_1987}

\bibitem[Ashkin et~al.]{ashkin, Dziedzic, Bjorkholm \harvardand{} Chu}{1986}{ashkin_ol_1986}