@article{FAA_1990_24_3_a5,
     author = {G. S. Petrov},
     title = {Non-oscillation of elliptic integrals},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {45--50},
     publisher = {mathdoc},
     volume = {24},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1990_24_3_a5/}
}