This is BibTeX, Version 0.99c (MiKTeX 2.7 Beta 4)
The top-level auxiliary file: rapport.aux
I couldn't open style file plain.bst.bst
---line 29 of file rapport.aux
 : \bibstyle{plain.bst
 :                    }
I'm skipping whatever remains of this command
I found no style file---while reading file rapport.aux
(There were 2 error messages)