@article{MAN_1984__267_163889,
     author = {J. Gonzalo and F. Varela},
     title = {Some {Surfaces} that are {Distinguishable} by the {Global} {Expression} of {Their} {Volume} {Elements.}},
     journal = {Mathematische Annalen},
     pages = {199--212},
     publisher = {mathdoc},
     volume = {267},
     year = {1984},
     zbl = {0519.57028},
     url = {http://geodesic.mathdoc.fr/item/MAN_1984__267_163889/}
}