by de Toledo, P., Rios, P.M., Ledezma, A., Sanchis, A., Alen, J.F., Lagares, A.
Published in IEEE transactions on information technology in biomedicine (01.09.2009)

by Koiller, Jair, Rios, Pedro P.M., Ehlers, Kurt M.
Published in Reports on mathematical physics (01.04.2002)