Geodesic
Non-negative eigenfunctions of the Beltrami--Laplace operator on symmetric spaces of non-positive curvature
Doklady Akademii Nauk, Tome 151 (1963) no. 6, pp. 1274-1276.

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@article{DAN_1963_151_6_a8,
     author = {F. I. Karpelevich},
     title = {Non-negative eigenfunctions of the {Beltrami--Laplace} operator on symmetric spaces of non-positive curvature},
     journal = {Doklady Akademii Nauk},
     pages = {1274--1276},
     publisher = {mathdoc},
     volume = {151},
     number = {6},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_151_6_a8/}
}
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F. I. Karpelevich. Non-negative eigenfunctions of the Beltrami--Laplace operator on symmetric spaces of non-positive curvature. Doklady Akademii Nauk, Tome 151 (1963) no. 6, pp. 1274-1276. http://geodesic.mathdoc.fr/item/DAN_1963_151_6_a8/