A MATRIX-MULTIPLICATIVE SOLUTION OF A SINGLE-SERVER SYSTEM WITH SERVICE INTERRUPTION, A FINITE QUEUE OF REPEAT CUSTOMERS, AND PHASE-TYPE DISTRIBUTIONS Article Atensia I.M., Bocharov P.P., Puzikova D.A. Avtomatika i Telemekhanika.
ON ISOTOPY OF BOL ALGEBRAS Article Bouetou Thomas B., Mikheev Pavel O. Webs & quasigroups. Tver State Univ., Tverʹ. 1994. P. 47-49