Salavisa, Isabel, Pedro  Videira, and C.  Sousa. ?The Emergence Of A Knowledge-Intensive Sector In Portugal: Social Networks And Innovation In The Software Sector?. {DIN}Â{MIA}{\textquotesingle}{CET}-{IUL}, 2011. doi:10.7749/dinamiacet-iul.wp.2011.13.

Salavisa, Isabel, Pedro  Videira, and Filipa  Santos. ?Entrepreneurship And Social Networks In It Sectors: The Case Of The Software Industry In Portugal?. Journal Of Innovation Economics 4. Journal Of Innovation Economics  (2009): 15. doi:10.3917/jie.004.0015.