@article{JSFU_2011_4_1_a0,
     author = {Alexandre M. Baranov},
     title = {Lightons and helixons as lightlike particles in general relativity},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
     pages = {3--10},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2011_4_1_a0/}
}