M. N. Slavtchova-Bojkova and P. S. Mateev, “RESEARCH AND EDUCATION IN STOCHASTICS AT THE FACULTY OF MATHEMATICS AND INFORMATICS OF SOFIA UNIVERSITY ‘ST. KLIMENT OHRIDSKI’”, Ann. Sofia Univ. Fac. Math. and Inf., vol. 102, pp. 5–29, Dec. 2015.