@article{IVM_1994_2_a12,
     author = {N. S. Shavokhina},
     title = {The problem of a~world surface that contracts world trajectories of particles},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {67--70},
     publisher = {mathdoc},
     number = {2},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1994_2_a12/}
}