V. Egido, R. Barber, M.A. Salichs. Algorithm of Topological Map Generation for the EDN Navigation System. IFAC Workshop on Mobile Robot Technology. Proceedings of the IFAC Workshop on Mobile Robot Technology, ISBN: 0-08-043902-0, pages: 285 - 290, J. Sasiadek (IFAC). 2001-05-23, Jejudo Island, Korea. 2001.