TY  - JOUR
AU  - A. L. Chistyakov
TI  - Defect indices of $J_m$-matrices and of differential operators with polynomial coefficients
JO  - Sbornik. Mathematics
PY  - 1971
SP  - 471
EP  - 500
VL  - 14
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1971_14_4_a1/
LA  - en
ID  - SM_1971_14_4_a1
ER  -