joe@joe-i7-Linux:~/Documentos/Universidad/iaa/Motion-Planning/doc/state_of_art$ bibtex stateofart.aux 
This is BibTeX, Version 0.99c (TeX Live 2009/Debian)
The top-level auxiliary file: stateofart.aux
I found no \bibdata command---while reading file stateofart.aux
I found no \bibstyle command---while reading file stateofart.aux
(There were 2 error messages)