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@article{PORMA_1997__54_2_47787, author = {Marenich, V. and Guadalupe, I.V.}, title = {Some inequalities for immersed surfaces.}, journal = {Portugaliae mathematica}, pages = {139--145}, publisher = {mathdoc}, volume = {54}, number = {2}, year = {1997}, zbl = {0880.53051}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1997__54_2_47787/} }
Marenich, V.; Guadalupe, I.V. Some inequalities for immersed surfaces.. Portugaliae mathematica, Tome 54 (1997) no. 2, pp. 139-145. http://geodesic.mathdoc.fr/item/PORMA_1997__54_2_47787/