Sos S. Agaian, Hakob Sarukhanyan, Jaakko T. Astola. Multiplicative-theorem-based fast Williamson-Hadamard transforms. In Edward R. Dougherty, Jaakko Astola, Karen O. Egiazarian, editors, Image Processing: Algorithms and Systems, San Jose, California, USA, January 19, 2002. Volume 4667 of SPIE Proceedings, pages 82-91, SPIE, 2002. [doi]
Abstract is missing.