TY  - BOOK
AU  - Oleinik,O.A.
AU  - Radkevich,E.V.
TI  - Second order equations with nonnegative characteristic form
SN  - 0306307510
PY  - 1973///
CY  - Providence, R.I.
PB  - American Mathematical Society
KW  - Differential equations, Partial
KW  - Boundary value problems
N1  - Translation of Uravneniia vtorogo poriadka s neotritsatelnoi kharakteristicheskoi formoi; Bibliography: p. 251-259
ER  -