@article{GDZPPN002201925,
title = {A parametric variational principle for minimal surfaces of varying topological type.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {346},
year = {1984},
pages = {16-49},
zbl = {0538.49029},
url = {http://dml.mathdoc.fr/item/GDZPPN002201925}
}
Tolksdorf, Peter. A parametric variational principle for minimal surfaces of varying topological type.. Journal für die reine und angewandte Mathematik, Tome 346 (1984) pp. 16-49. http://gdmltest.u-ga.fr/item/GDZPPN002201925/