TY  - BOOK
AU  - Oleinik,O. A.
AU  - Radkevic,E. V.
TI  - SECOND ORDER EQUATIONS WITH NONNEGATIVE CHARACTERISTICS FORM
SN  - 0306307510
U1  - 515.353 
PY  - 1973///
CY  - 
PB  - American Mathematical Society, Providence
KW  - Differential Equations,Partial
N1  - Includes Bibliographical References; Translated From Russian
ER  -