@article{JRAM_1986__368_152834,
     author = {Michael Struwe},
     title = {A {Morse} theory for annulus-type minimal surfaces.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--27},
     publisher = {mathdoc},
     volume = {368},
     year = {1986},
     zbl = {0605.58018},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1986__368_152834/}
}