The first eigenvalue of the laplacian on manifolds of non-negative curvature
Compositio Mathematica, Tome 29 (1974) no. 1, pp. 43-53. 
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     author = {Chavel, Isaac and Feldman, Edgar A.},
     title = {The first eigenvalue of the laplacian on manifolds of non-negative curvature},
     journal = {Compositio Mathematica},
     pages = {43--53},
     publisher = {Noordhoff International Publishing},
     volume = {29},
     number = {1},
     year = {1974},
     mrnumber = {356142},
     zbl = {0291.53021},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1974__29_1_43_0/}
}
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Chavel, Isaac; Feldman, Edgar A. The first eigenvalue of the laplacian on manifolds of non-negative curvature. Compositio Mathematica, Tome 29 (1974) no. 1, pp. 43-53. http://archive.numdam.org/item/CM_1974__29_1_43_0/

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