@article{MM2_1981__34_154781,
     author = {E. Gonzalez and U. Massari},
     title = {Minimal {Boundaries} {Enclosing} {A} {Given} {Volume.}},
     journal = {Manuscripta mathematica},
     pages = {381--395},
     publisher = {mathdoc},
     volume = {34},
     year = {1981},
     zbl = {0481.49035},
     url = {http://geodesic.mathdoc.fr/item/MM2_1981__34_154781/}
}