K. Aberer, T. Risse, и A. Wombacher. Conference proceedings of the 2001 IEEE International Performance, Computing, and Communications Conference : Phoenix, Arizona, U.S.A., April 4 - 6, 2001, Piscataway, NJ, IEEE Service Center, (2001)
T. Risse. From Integrated Publication and Information Systems to Virtual Information and Knowledge Environments, том 3379 из Lecture Notes in Computer Science, стр. 1-10. Springer, (2005)