On Blaschke manifolds and harmonic manifolds
Séminaire de théorie spectrale et géométrie, Tome 6 (1987-1988), pp. 33-37. 
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     author = {Kiyohara, Kazuyoshi},
     title = {On {Blaschke} manifolds and harmonic manifolds},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {33--37},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {6},
     year = {1987-1988},
     mrnumber = {1046254},
     zbl = {1149.53312},
     language = {en},
     url = {http://www.numdam.org/item/TSG_1987-1988__6__33_0/}
}
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Kiyohara, Kazuyoshi. On Blaschke manifolds and harmonic manifolds. Séminaire de théorie spectrale et géométrie, Tome 6 (1987-1988), pp. 33-37. http://www.numdam.org/item/TSG_1987-1988__6__33_0/

[1] Besse A. - Manifolds all of whose geodesics are closed, Springer, 1978. | MR | Zbl