@article{MZM_1990_48_2_a9,
     author = {S. M. Natanzon},
     title = {Klein supersurfaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {72--82},
     year = {1990},
     volume = {48},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_2_a9/}
}