TY  - JOUR
AU  - A. P. Norden
AU  - N. M. Ostianu
AU  - V. V. Ryzhkov
TI  - German Fedorovich Laptev (on his sixtieth birthday)
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1970
SP  - 239
EP  - 244
VL  - 25
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1970_25_5_a10/
LA  - en
ID  - RM_1970_25_5_a10
ER  -