@article{MZ_1976__148_172355,
     author = {Harvey B. Keynes and Dan Newton},
     title = {A },
     journal = {Mathematische Zeitschrift},
     pages = {101--106},
     publisher = {mathdoc},
     volume = {148},
     year = {1976},
     zbl = {0308.28014},
     url = {http://geodesic.mathdoc.fr/item/MZ_1976__148_172355/}
}