@article{GDZPPN00208306X,
title = {When is a Polygon Circumscribing a Regular Polygon Again Regular?},
journal = {Elemente der Mathematik},
volume = {48},
year = {1993},
pages = {17-26},
zbl = {0778.51006},
url = {http://dml.mathdoc.fr/item/GDZPPN00208306X}
}
Bennish, J.; Gau, Y.D. When is a Polygon Circumscribing a Regular Polygon Again Regular?. Elemente der Mathematik, Tome 48 (1993) pp. 17-26. http://gdmltest.u-ga.fr/item/GDZPPN00208306X/