@article{JSFU_2020_13_1_a0,
     author = {Ammar Alsaedy and Nikolai Tarkhanov},
     title = {A degree theory for {Lagrangian} boundary value problems},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
     pages = {5--25},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2020_13_1_a0/}
}