TY  - BOOK
AU  - Lavrent'ev M A
TI  - On the theory of long waves
U1  - 510T 
PY  - 1954///
CY  - Providence
PB  - AMS
KW  - Mathematics
N1  - Tr from Recueil des Travaux de L'Instttut Math de L'Academie
ER  -