TY  - BOOK
AU  - Yakubovich,V.A & Starzhinskii,V.M
ED  - Starzhinskii, V.M
TI  - Linear differential equations with periodic coefficients. Vol.1
U1  - 10.01 
PY  - 1975///
CY  - New York
PB  - John Wiley & Sons
ER  -