TY  - GEN
AU  - Sneddon,Ian Naismith
TI  - Elements of partial differential equations
SN  - 0070857407
AV  - QA374 
PY  - 1957///
CY  - New York
PB  - McGraw-Hill, 
KW  - Differential equations Partial
N1  - Dizin
ER  -