@article{MZ_1975__145_172283,
     author = {Norman L. Johnson},
     title = {Regularly {Derived} {Planes.}},
     journal = {Mathematische Zeitschrift},
     pages = {201--210},
     publisher = {mathdoc},
     volume = {145},
     year = {1975},
     zbl = {0322.50011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1975__145_172283/}
}