@article{GDZPPN00220357X,
title = {A Morse theory for annulus-type minimal surfaces.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {372},
year = {1986},
pages = {1-27},
zbl = {0605.58018},
url = {http://dml.mathdoc.fr/item/GDZPPN00220357X}
}
Struwe, Michael. A Morse theory for annulus-type minimal surfaces.. Journal für die reine und angewandte Mathematik, Tome 372 (1986) pp. 1-27. http://gdmltest.u-ga.fr/item/GDZPPN00220357X/