@article{RM_1969_24_6_a3,
     author = {M. A. Olshanetsky},
     title = {The {Martin} boundary for the {Laplace--Beltrami} operator on {a~Riemannian} symmetric space of nonpositive curvature},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {24},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1969_24_6_a3/}
}