TY  - BOOK
AU  - Erugin, Nikolay P.
TI  - Linear systems of ordinary diffential equations with periodic and quasi-periodic coefficients
T2  - Mathematics in science and enginering
U1  - 517.38 
PY  - 1966///
CY  - New York
PB  - Academic Press
KW  - Ecuaciones diferenciales
ER  -