@article{MS2_1967__20_165995,
     author = {Jan Boman},
     title = {Differentiability of a {Function} and of its {Compositions} with {Functions} of {One} {Variable.}},
     journal = {Mathematica Scandinavica},
     pages = {249--268},
     publisher = {mathdoc},
     volume = {20},
     year = {1967},
     zbl = {0182.38302},
     url = {http://geodesic.mathdoc.fr/item/MS2_1967__20_165995/}
}