000 00316nam a22000977a 4500
008 210224b ||||| |||| 00| 0 eng d
050 _aQA401 .T93
245 _aPartial differential equations of mathematical physics
_cTYCHONOV, A.N.
260 _aLONDON
_bHOLDEN-DAY
_c1964
942 _2lcc
_hQA401 .T93 1964
999 _c635
_d635