TY  - JOUR
AU  - E. I. Pustyl'nik
TI  - Absolutely concave functions of positive operators
JO  - Doklady Akademii Nauk
PY  - 1976
SP  - 547
EP  - 550
VL  - 228
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1976_228_3_a7/
LA  - ru
ID  - DAN_1976_228_3_a7
ER  -