@article{CMH_1993__68_2_140315,
     author = {Shin Nayatani},
     title = {Morse index and {Gauss} maps of complete minimal surfaces in {Euclidean} 3-space.},
     journal = {Commentarii mathematici Helvetici},
     pages = {511--537},
     publisher = {mathdoc},
     volume = {68},
     number = {2},
     year = {1993},
     zbl = {0797.58018},
     url = {http://geodesic.mathdoc.fr/item/CMH_1993__68_2_140315/}
}