@article{FAA_1998_32_3_a3,
     author = {P. E. Pushkar'},
     title = {Maslov {Index} and {Symplectic} {Sturm} {Theorems}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {35--49},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1998_32_3_a3/}
}