@article{FAA_1986_20_2_a1,
     author = {N. A. Bobylev},
     title = {Topological index of extremals of multidimensional variational problems},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {8--13},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1986_20_2_a1/}
}