@article{TM_1992_193_a34,
     author = {A. A. Tuzhilin},
     title = {On the index of minimal surfaces},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {183--188},
     publisher = {mathdoc},
     volume = {193},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1992_193_a34/}
}