G. Tzagkarakis, B. Beferull-Lozano, and P. Tsakalides. Signals, Systems and Computers, 2004. Conference Record of the Thirty-Eighth
Asilomar Conference on, 1, page 397--401. IEEE Computer Society, (2004)
P. Dewan, A. Vikram, and B. Bhargava. Proceedings of the 3rd International Conference, FODO'89, page 389--403. Paris, France, Springer-Verlag, (June 1989)