John H. Gennari, Mark A. Musen, Ray W. Fergerson, William E. Grosso, Monica Crubézy, Henrik Eriksson, Natalya Fridman Noy, Samson W. Tu. The evolution of Protégé: an environment for knowledge-based systems development. International Journal of Man-Machine Studies, 58(1):89-123, 2003. [doi]