TY  - JOUR
AU  - N. H. Ibragimov
TI  - Group properties of wave equations for particles of zero mass
JO  - Doklady Akademii Nauk
PY  - 1968
SP  - 566
EP  - 568
VL  - 178
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1968_178_3_a16/
LA  - ru
ID  - DAN_1968_178_3_a16
ER  -