@article{JRAM_1984__354_152675,
     author = {Peter Tolksdorf},
     title = {A parametric variational principle for minimal surfaces of varying topological type.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {16--49},
     publisher = {mathdoc},
     volume = {354},
     year = {1984},
     zbl = {0538.49029},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1984__354_152675/}
}