@article{TMF_2009_158_1_a2,
     author = {V. A. Geiler and D. A. Ivanov and I. Yu. Popov},
     title = {Approximation of a~point perturbation on {a~Riemannian} manifold},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {49--57},
     publisher = {mathdoc},
     volume = {158},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2009_158_1_a2/}
}