@article{01044056, title = {Some inequalities for immersed surfaces.}, journal = {Portugaliae Mathematica. Nova S\'erie}, volume = {54}, year = {1997}, pages = {139-145}, zbl = {0880.53051}, language = {en}, url = {http://dml.mathdoc.fr/item/01044056} }
Marenich, V.; Guadalupe, I.V. Some inequalities for immersed surfaces.. Portugaliae Mathematica. Nova Série, Tome 54 (1997) pp. 139-145. http://gdmltest.u-ga.fr/item/01044056/