000 00291nam a2200121Ia 4500
008 210901s1972 xx 000 0 eng d
082 _a512.897 OPE
100 _aOpen University
245 0 _aBoundary value problems
260 _bOpen University
_c1972
300 _a36p.
942 _2ddc
_cBK
999 _c10413
_d10413