@article{IM_1991__103_1_143868,
     author = {S.T. Yau and F. Zheng},
     title = {Negatively 1/4-pinched riemannian metric on a compact {K\"ahler} manifold.},
     journal = {Inventiones mathematicae},
     pages = {527--536},
     publisher = {mathdoc},
     volume = {103},
     number = {1},
     year = {1991},
     zbl = {0792.53064},
     url = {http://geodesic.mathdoc.fr/item/IM_1991__103_1_143868/}
}