TY  - BOOK
AU  - Smirnov. M.M.
AU  - Chomets, S
TI  - Second- order partial differential equations
U1  - 517.38 SMS 
PY  - 1966///
CY  - Groningen p
PB  - Noordhoff
KW  - Equations, Theory
N1  - Includes illus
ER  -