@article{GDZPPN002082764, title = {An extension of Blaschke's theorem in the plane.}, journal = {Elemente der Mathematik}, volume = {46}, year = {1991}, pages = {102-106}, zbl = {0738.52009}, url = {http://dml.mathdoc.fr/item/GDZPPN002082764} }
Scott, P.R. An extension of Blaschke's theorem in the plane.. Elemente der Mathematik, Tome 46 (1991) pp. 102-106. http://gdmltest.u-ga.fr/item/GDZPPN002082764/