@article{GDZPPN002058634, title = {On the Isoperimetric Problem in a Riemann Space.}, journal = {Commentarii mathematici Helvetici}, volume = {41}, year = {1966}, pages = {18-29}, zbl = {0148.15801}, url = {http://dml.mathdoc.fr/item/GDZPPN002058634} }
Katsurada, Yoshie. On the Isoperimetric Problem in a Riemann Space.. Commentarii mathematici Helvetici, Tome 41 (1966) pp. 18-29. http://gdmltest.u-ga.fr/item/GDZPPN002058634/