@article{MZM_1973_13_5_a8,
     author = {V. Golo},
     title = {The {Maslov{\textendash}Morse} index of indefinite metrics},
     journal = {Matemati\v{c}eskie zametki},
     pages = {703--708},
     year = {1973},
     volume = {13},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_5_a8/}
}