N. Amersi, O. Beckwith, S. Miller, R. Ronan, und J. Sondow. (2011)cite arxiv:1108.0475Comment: 13 pages, 2 tables, to appear in the CANT 2011 Conference Proceedings. This is version 2.0. Changes: fixed typos, added references to OEIS sequences, and cited Shevelev's preprint.
T. Cao. Proceedings of the 9th International Conference on Conceptual Structures (ICCS 2001), Volume 2120 von Lecture Notes in Computer Science, Seite 87-100. Springer, (2001)
A. Dimov, und S. Ilieva. Proceedings of the 2007 international conference on Computer systems and technologies, Seite 18:1--18:6. New York, NY, USA, ACM, (2007)