The first eigenvalue of the laplacian for a positively curved homogeneous riemannian manifold
Compositio Mathematica, Tome 59 (1986) no. 1, pp. 57-71. 
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     author = {Urakawa, Hajime},
     title = {The first eigenvalue of the laplacian for a positively curved homogeneous riemannian manifold},
     journal = {Compositio Mathematica},
     pages = {57--71},
     publisher = {Martinus Nijhoff Publishers},
     volume = {59},
     number = {1},
     year = {1986},
     mrnumber = {850121},
     zbl = {0615.53040},
     language = {en},
     url = {http://www.numdam.org/item/CM_1986__59_1_57_0/}
}
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Urakawa, Hajime. The first eigenvalue of the laplacian for a positively curved homogeneous riemannian manifold. Compositio Mathematica, Tome 59 (1986) no. 1, pp. 57-71. http://www.numdam.org/item/CM_1986__59_1_57_0/

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