TY  - BOOK
AU  - Gradstein I S
TI  - Linear equations with variable coefficients and small parameters in the highest derivatives
U1  - 510T 
PY  - 1953///
CY  - Providence
PB  - AMS
KW  - Linear equations
KW  - Mathematics
N1  - Tr from Matematiceskii Sbornik N.S.27 (69), 47-68 (1950)
ER  -