@book{kon2012,
  title={Software Livre e Propriedade Intelectual: Aspectos Jur{\'\i}dicos, Licen{\c{c}}as e Modelos de Neg{\'o}cios},
  author={Kon, Fabio and Lago, Nelson and Meirelles, Paulo and Sabino, Vanessa},
  journal={http://ccsl. ime. usp. br/files/slpi. pdf>. Acesso em},
  volume={2},
  pages={12},
  year={2012}
}

@article{hippel2003,
 author = {Hippel, Eric von and Krogh, Georg von},
 title = {Open Source Software and the "Private-Collective" Innovation Model: Issues for Organization Science},
 journal = {Organization Science},
 issue_date = {March 2003},
 volume = {14},
 number = {2},
 month = mar,
 year = {2003},
 issn = {1526-5455},
 pages = {209--223},
 numpages = {15},
 url = {http://dx.doi.org/10.1287/orsc.14.2.209.14992},
 doi = {10.1287/orsc.14.2.209.14992},
 acmid = {970585},
 publisher = {INFORMS},
 address = {Institute for Operations Research and the Management Sciences (INFORMS), Linthicum, Maryland, USA},
 keywords = {Incentives, Innovation, Open source software, User innovation, users, collective action},
} 

@phdthesis{meirelles2013,
   title={Monitoring Source Code Metrics in Free Software Projects},
   author={Meirelles, Paulo Roberto Miranda},
   year={2013},
   school={Department of Computer Science -- Institute of Mathematics and Statistics of University of S{\~a}o Paulo},
   note = {[in portuguese]},
   url={http://www.teses.usp.br/teses/disponiveis/45/45134/tde-27082013-090242/en.php}
}

@mastersthesis{sabino2009,
  title={A systematic study on Free Software License},
  author={Vanessa Sabino},
  year={2009},
  school={Department of Computer Science -- Institute of Mathematics and Statistics of University of S{\~a}o Paulo},
   note = {[in portuguese]},
   url={http://www.teses.usp.br/teses/disponiveis/45/45134/tde-14032012-003454/en.php}

}