@article{TMF_2017_191_2_a8,
     author = {I. V. Maresin},
     title = {Conformal reference frames for {Lorentzian} manifolds},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {243--253},
     publisher = {mathdoc},
     volume = {191},
     number = {2},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2017_191_2_a8/}
}