John M. Richardson Vrudhula K. Murthy L. Julian Haywood Recognition of generalized markoff processes and application to electrocardiography. 51-56 1978 14 Inf. Sci. 1 http://dx.doi.org/10.1016/0020-0255(78)90026-9 db/journals/isci/isci14.html#RichardsonMH78