@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},
     publisher = {mathdoc},
     volume = {234},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1996_234_a5/}
}