000 002910000a22001210004500
245 _aIntroduction to differential equations
100 _aGreen, S.L.
260 _aLondon
_bUniversity Tutorial Press
_c1965
300 _a139p.
080 _a517.9
_bG7
041 _aEN
942 _cBK
_01
999 _c115659
_d115659