1. Sawyer, S.: Packaged software: implications of the differences from custom approaches to software development. European Journal of Information Systems 9, 47–58 (2000)
2. Xu, L., Brinkkemper, S.: Concepts of product software: Paving the road for urgently needed research. In: Castro, J., Teniente, E. (eds.) PHISE 2005, pp. 523–528. FEUP Press (2005)
3. Regnell, B., Höst, M., Natt och Dag, J.: An industrial case study on distributed prioritization in market-driven requirements engineering for packaged software. Requirements Engineering 6, 51–62 (2001)
4. Weerd, I.v., Brinkkemper, S., Nieuwenhuis, R., Versendaal, J., Bijlsma, L.: On the Creation of a Reference Framework for Software Product Management: Validation and Tool Support. In: International Workshop on Software Product Management (IWSPM 2006 - RE 2006), pp. 312–315. Minneapolis/St. Paul, Minnesota (2006)
5. Artz, P., Weerd, I.v., Brinkkemper, S.: Productization: An exploratory research project Technical report UU-CS-2010-003. Institute of Computing and Information Sciences, Utrecht University,
http://www.cs.uu.nl/research/techreps/UU-CS-2010-003.html