International Mathematical Forum. Journal for Theory and Applications (Int. Math. Forum) (20100101), 5, no.~37-40, 1959-1964. ISSN: 1312-7594 (print).eISSN: 1314-7536.
International Mathematical Forum. Journal for Theory and Applications (Int. Math. Forum) (20100101), 5, no.~37-40, 1951-1957. ISSN: 1312-7594 (print).eISSN: 1314-7536.