TY  - JOUR
AU  - S. A. Pak
TI  - Sign-preserving conditions for the Green's function of a Sturm--Liouville problem
JO  - Doklady Akademii Nauk
PY  - 1963
SP  - 1265
EP  - 1267
VL  - 148
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1963_148_6_a7/
LA  - ru
ID  - DAN_1963_148_6_a7
ER  -