T. Norman, and N. Jennings. Agents and Multi-Agent Systems Formalisms, Methodologies, and Applications, volume 1441 of Lecture Notes in Computer Science, page 123-133. Springer, (1997)
C. Sierra, P. Faratin, and N. Jennings. Collaboration between Human and Artificial Societies, volume 1624 of Lecture Notes in Computer Science, page 201-219. Springer, (1999)