@article{MOMA_1966__70_177358,
     author = {S.N. Mukhopadadhyay},
     title = {On {Approximate} {Schwarz} {Differentiability.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {454--460},
     publisher = {mathdoc},
     volume = {70},
     year = {1966},
     zbl = {0173.05304},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1966__70_177358/}
}