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@article{CMH_1966__41_139310, author = {Yoshie Katsurada}, title = {On the {Isoperimetric} {Problem} in a {Riemann} {Space.}}, journal = {Commentarii mathematici Helvetici}, pages = {18--29}, publisher = {mathdoc}, volume = {41}, year = {1966}, zbl = {0148.15801}, url = {http://geodesic.mathdoc.fr/item/CMH_1966__41_139310/} }
Yoshie Katsurada. On the Isoperimetric Problem in a Riemann Space.. Commentarii mathematici Helvetici, Tome 41 (1966), pp. 18-29. http://geodesic.mathdoc.fr/item/CMH_1966__41_139310/