SEMI-MARKOV PROCESSES IN PERIODIC SYSTEMS WITH STATES OF TWO TYPES СтатьяMijáilov Iliá Davídovich, Hernández Placeres Juan M.Revista Ciencias Matemáticas. Том 5. 1984. С. 57-66
METRIZED THEOREM FOR LOCALLY COMPACT CONNECTED LEFT LOOPS WITH INVARIANT UNIFORMITY СтатьяSessou PaulWebs & quasigroups. 1995. С. 110-113