Geodesic
Quarter pinched homogeneous spaces of negative curvature
Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part 15–1, Tome 234 (1996), pp. 39-40 
Patric Eberlein; Teus Heber. Quarter pinched homogeneous spaces of negative curvature. Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part 15–1, Tome 234 (1996), pp. 39-40. http://geodesic.mathdoc.fr/item/ZNSL_1996_234_a5/
@article{ZNSL_1996_234_a5,
     author = {Patric Eberlein and Teus Heber},
     title = {Quarter pinched homogeneous spaces of negative curvature},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {39--40},
     year = {1996},
     volume = {234},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1996_234_a5/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

Certain properties of simply connected spaces with quarter pinched sectional curvature $K$, $-4, are considered. Additional conditions guaranteeing that the corresponding group of isometries is a symmetric space are given.