@article{IM_1986__85_143383,
     author = {S.T. Yau and L.Z. Gao},
     title = {The existence of negatively {Ricci} curved metrics on three manifolds.},
     journal = {Inventiones mathematicae},
     pages = {637--652},
     publisher = {mathdoc},
     volume = {85},
     year = {1986},
     zbl = {0603.53025},
     url = {http://geodesic.mathdoc.fr/item/IM_1986__85_143383/}
}