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@article{ELMA_1963__18_140779, author = {J. Steinig}, title = {Inequalities {Concerning} the {Inradius} and {Circumradius} of a {Triangle.}}, journal = {Elemente der Mathematik}, pages = {127--131}, publisher = {mathdoc}, volume = {18}, year = {1963}, zbl = {0116.12907}, url = {http://geodesic.mathdoc.fr/item/ELMA_1963__18_140779/} }
J. Steinig. Inequalities Concerning the Inradius and Circumradius of a Triangle.. Elemente der Mathematik, Tome 18 (1963), pp. 127-131. http://geodesic.mathdoc.fr/item/ELMA_1963__18_140779/