On the Approximation of the Substitution Costs for Free/Libre Open Source Software. - Kirsten Haaland; Ioannis Stamelos; Rishab Ghosh; Ruediger Glott (BCI, 2009)

Annals of Knowledge Sharing in Distributed Software Development Environments: Experience from Open Source Software Projects. - Sulayman K. Sowe; Rishab Ghosh; Luc Soete (Software Engineering (Workshops), 2009)