A. Hyvärinen, J. Hurri, и J. Väyrynen. Journal of the Optical Society of America A, 20 (7):
1237--1252(2003)Reprinted in Virtual Journal of Biological Physics Research, 6(2), 2003.
J. Hurri, J. Väyrynen, и A. Hyvärinen. Proceedings of NCPW8, Neural Computation and Psychology Workshop, Connectionist Models of Cognition and Perception II, 15, стр. 29--38. World Scientific, (2004)