@article{TMF_1985_64_1_a4,
     author = {W. I. Fushchych and I. M. Tsyfra},
     title = {Symmetry of nonlinear electrodynamic equations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {41--50},
     publisher = {mathdoc},
     volume = {64},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1985_64_1_a4/}
}