@article{DAN_1973_208_5_a8,
     author = {\`E. Muhamadiev},
     title = {On the theory of periodic solutions of nonlinear systems of elliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {1035--1037},
     publisher = {mathdoc},
     volume = {208},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_208_5_a8/}
}