This is BibTeX, Version 0.99d (TeX Live 2012)
The top-level auxiliary file: Hausarbeit_die achtzigste.aux
The style file: myplainnat.bst
Ôªø is an illegal style-file command---line 1 of file myplainnat.bst
: Ôªø
: %% File: `plainnat.bst'
key is an unknown function---line 247 of file myplainnat.bst
author is an unknown function---line 253 of file myplainnat.bst
我不知道该怎么办。请帮帮我。