@article{GDZPPN002476932, title = {Fields of Planar Bodies Tangent to Spheres.}, journal = {Monatshefte f\"ur Mathematik}, volume = {74}, year = {1970}, pages = {145-149}, zbl = {0189.52901}, url = {http://dml.mathdoc.fr/item/GDZPPN002476932} }
Mani, P. Fields of Planar Bodies Tangent to Spheres.. Monatshefte für Mathematik, Tome 74 (1970) pp. 145-149. http://gdmltest.u-ga.fr/item/GDZPPN002476932/