TY  - BOOK
AU  - Ross S.L
TI  - Introduction to ordinary differential equations
U1  - B331, K63;M0 
PY  - 1980///
CY  - New York 
PB  - John Wiley and Sons   
KW  -  Linear differential equations
KW  - Differential equations
N1  - Appendix 475-480p
ER  -