@article{GDZPPN002075326, title = {Inequalities Concerning the Inradius and Circumradius of a Triangle.}, journal = {Elemente der Mathematik}, volume = {18}, year = {1963}, pages = {127-131}, zbl = {0116.12907}, url = {http://dml.mathdoc.fr/item/GDZPPN002075326} }
Steinig, J. Inequalities Concerning the Inradius and Circumradius of a Triangle.. Elemente der Mathematik, Tome 18 (1963) pp. 127-131. http://gdmltest.u-ga.fr/item/GDZPPN002075326/