<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Baum, Leonard E. / Petrie, Ted</hi> (1966): „Statistical inference for probabilistic functions of finite state markov chains“, in: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">The annals of mathematical statistics 37</hi> (6) :1554–1563.  