@article{TMF_1981_47_3_a5,
     author = {Yu. P. Stepanovskii},
     title = {Wave equations for massless fields},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {343--351},
     publisher = {mathdoc},
     volume = {47},
     number = {3},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1981_47_3_a5/}
}