P. Martin, и P. Eklund. 7th International Conference on Conceptual Structures (ICCS'99), 1640, стр. 315-333. Springer Verlag, Berlin, Berlin, (1999)Solution to the Sisyphus-I problem using WebKB.
B. Groh, и P. Eklund. Conceptual Structures:Standards and Practice: 7th International Conference on Conceptual Graphs, ICCS'99, 1640, стр. 389-400. Springer Verlag, (1999)
P. Martin, и P. Eklund. Conceptual Structures:Standards and Practice: 7th International Conference on Conceptual Graphs, ICCS'99, 1640, стр. 230-246. Springer Verlag, (1999)
P. Martin, и P. Eklund. Workshop on Virtual Documents, Hypertext and Functionality and the World Wide Web, стр. 35-40. Technical Report, Department of Computer Science, University of Bolonga, (1999)
P. Martin. Conceptual Structures: Standards and Practice: 7th International Conference on Conceptual Graphs, 1867, стр. 41-54. Springer Verlag, (2000)Detailed description of the notational conventions used for knowledge engineering in WebKB-2.