000 00263nam a2200109Ia 4500
999 _c28769
_d28769
020 _a9780070857407
100 _aIan N Sneddon.
245 _aElements of Partial Differential Equations
260 _c1957
_bMcGRAW HILL
_aNew Delhi
300 _aix+327
942 _cBB