@article{TSG_1991__S9__47_0,
     author = {Castro Lopez, Ildefonso and Ritore, Manuel},
     title = {Index of minimal surfaces and index of constant mean curvature surfaces},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {47--48},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {S9},
     year = {1991},
     language = {en},
     url = {http://www.numdam.org/item/TSG_1991__S9__47_0/}
}