@article{DAN_1991_318_6_a1,
     author = {A. K. Guts},
     title = {A topos-theoretic approach to the foundations of relativity},
     journal = {Doklady Akademii Nauk},
     pages = {1294--1297},
     year = {1991},
     volume = {318},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_318_6_a1/}
}