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@article{MS2_1960__8_165744, author = {Kjell Bj\"orup}, title = {On {Inequalities} of {Poincar\'e's} {Type.}}, journal = {Mathematica Scandinavica}, pages = {157--167}, publisher = {mathdoc}, volume = {8}, year = {1960}, zbl = {0196.41303}, url = {http://geodesic.mathdoc.fr/item/MS2_1960__8_165744/} }
Kjell Björup. On Inequalities of Poincaré's Type.. Mathematica Scandinavica, Tome 8 (1960), pp. 157-167. http://geodesic.mathdoc.fr/item/MS2_1960__8_165744/