000 00298nam a2200097 4500
080 _a517.944
_bGRA.80
245 _aNonlinear partial differential equations in physical problems
100 _aGraffi, D
260 _aBoston
_bPitman Advanced Publishing program
_c1980
300 _a105p
440 _vResearch notes in mathematics. 42
999 _c28154
_d28154