Contains the keyword closed source software
Security of Open Source and Closed Source Software: An Empirical Comparison of Published Vulnerabilities. AMCIS 2009 Proceedings [Internet]. 2009;:387. http://epub.uni-regensburg.de/21296/1/Schryen_-_AMCIS_09_-_Security_of_open_source_and_closed_source_software_-_Web_version.pdf Schryen_-_AMCIS_09_-_Security_of_open_source_and_closed_source_software_-_Web_version.pdf (442.07 KB) .
Trust and vulnerability in open source software. Software, {IEE} Proceedings -. 2002;149(1):47–51. .