How to compile tex file (with bibtex): 

0) remove ( if exist)  x.bib
1) latex   YourTeXFileName
2) bibtex  YourTeXFileName
3) latex   YourTeXFileName
4) latex   YourTeXFileName


Then you can make ps and pdf files

Remark: if Bibliography is not changed then you can omit items 0)1)2) 