@article{ELMA_1993__48_4_141540,
     author = {J. Bennish and Y.D. Gau},
     title = {When is a {Polygon} {Circumscribing} a {Regular} {Polygon} {Again} {Regular?}},
     journal = {Elemente der Mathematik},
     pages = {17--26},
     publisher = {mathdoc},
     volume = {48},
     number = {4},
     year = {1993},
     zbl = {0778.51006},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1993__48_4_141540/}
}