@article{LKN_2017_a0,
     author = {M. O. Katanaev},
     title = {Mathematical foundations of general relativity. {Part} 1},
     journal = {Lekcionnye kursy NOC},
     pages = {3--311},
     publisher = {mathdoc},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/LKN_2017_a0/}
}