@article{IVM_1991_4_a9,
     author = {V. S. Sobchuk},
     title = {Geodesic mapping of {Ricci} 4-symmetric {Riemannian} spaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {69--70},
     year = {1991},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1991_4_a9/}
}