@article{ELMA_1966__21_140820,
     author = {Michael Goldberg},
     title = {Rotors of {Variable} {Regular} {Polygons.}},
     journal = {Elemente der Mathematik},
     pages = {25--28},
     publisher = {mathdoc},
     volume = {21},
     year = {1966},
     zbl = {0137.15301},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1966__21_140820/}
}