TY - JOUR AU - G. A. Kalyabin TI - A necessary and sufficient condition for the discreteness of the spectrum of a monomial operation in the matrix case JO - Differencialʹnye uravneniâ PY - 1973 SP - 951 EP - 954 VL - 9 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1973_9_5_a20/ LA - ru ID - DE_1973_9_5_a20 ER -