@article{MZ_1972__128_171805,
     author = {Helmut Kaul},
     title = {Remarks on the {Isoperimetric} {Inequality} for {Multiply-connected} {H-Surfaces.}},
     journal = {Mathematische Zeitschrift},
     pages = {271--276},
     publisher = {mathdoc},
     volume = {128},
     year = {1972},
     zbl = {0242.53001},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__128_171805/}
}