@article{DAN_1963_152_1_a9,
     author = {G. I. Kruchkovich},
     title = {Geodesic correspondence of semi-reducible {Riemannian} spaces},
     journal = {Doklady Akademii Nauk},
     pages = {43--45},
     publisher = {mathdoc},
     volume = {152},
     number = {1},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_1_a9/}
}