@article{MZ_1978__162_172732,
     author = {Manfredo do Carmo and Joao Lucas Barbosa},
     title = {A {Proof} of a {General} {Isoperimetric} {Inequality} for {Surfaces.}},
     journal = {Mathematische Zeitschrift},
     pages = {245--262},
     publisher = {mathdoc},
     volume = {162},
     year = {1978},
     zbl = {0369.53054},
     url = {http://geodesic.mathdoc.fr/item/MZ_1978__162_172732/}
}