@article{VMUMM_1986_3_a22,
     author = {I. V. Gribkov},
     title = {Reduction in the order of recurrence of $3$-recurrent properly {Riemannian} spaces},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {104--106},
     publisher = {mathdoc},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1986_3_a22/}
}