TY  - BOOK
AU  - Guterman, Martin M.
AU  -  Nitecki, Zbigniew H.
TI  - Differential equations
SN  - 0-03-072878-9
CY  - New York
KW  -  Linear equations
KW  -  Science
KW  -  Vatiable coefficients
KW  - Differential equations
KW  - Mathematics
ER  -