1. J. Hagenauer, P. Hoeher, A Viterbi algorithm with soft-decision outputs and its applications. In: Proc. IEEE Globecom' 89, Dallas, Texas, Nov 1989, p. 47.1.1-47.1.7.
2. G. Battail: Pondéraiion des symboles dicodis par I'algorithme. de Viterbi. (in French), “Ann. Telecomm.”, No. i-2, Jan-Fev. n1987, p. 31-38.
3. C. Berrou, P. Adde, E. Angui, S. Faudeil: A low complexity softoutput Viterbi decoder architecture. In: Proc. IEEE Int. Conf. On Comm., ICC− 93, Vol. 2/3, May 1993, p. 737-740.
4. C. Berrou, A. Glavieux, P. Thitimajshima: Near Shannon limit I error-correcting coding and decoding: Turbo-codes. In: Proc. IEEE Int. Conf. on Comm., ICC 93, Vol. 2/3, May 1993, p. i1064-1071.