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@article{MS2_1977__40_166535, author = {Per Sj\"oln}, title = {An inequality for convex curves in the plane.}, journal = {Mathematica Scandinavica}, pages = {293--300}, publisher = {mathdoc}, volume = {40}, year = {1977}, zbl = {0369.52005}, url = {http://geodesic.mathdoc.fr/item/MS2_1977__40_166535/} }
Per Sjöln. An inequality for convex curves in the plane.. Mathematica Scandinavica, Tome 40 (1977), pp. 293-300. http://geodesic.mathdoc.fr/item/MS2_1977__40_166535/