@article{MZ_1967__102_170868,
     author = {D.H. Tucker and R.J. Easton and S. Wayment},
     title = {On the {Existence} {Almost} {Everywhere} of the {Cross} {Partial} {Derivatives.}},
     journal = {Mathematische Zeitschrift},
     pages = {171--176},
     publisher = {mathdoc},
     volume = {102},
     year = {1967},
     zbl = {0153.08802},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__102_170868/}
}