000 00259nam a22000857a 4500
008 231205s1975 ru ||||| |||| 00| 0 fre d
100 _aPontriaguine, L.
_9284329
245 _aEquations differentielles ordinaires /
_cL. Pontriaguine.
264 _aM. :
_bMir,
_c1975.
999 _c722929
_d722927