@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/}
}