@article{COMIM_2011__19_1_a4,
     author = {Zhang, Jing and Ma, Bingqing},
     title = {Gradient estimates for a nonlinear equation $\Delta_fu+cu^{-\alpha}=0$ on complete noncompact manifolds},
     journal = {Communications in Mathematics},
     pages = {73--84},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {2011},
     mrnumber = {2855392},
     zbl = {1242.58011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/COMIM_2011__19_1_a4/}
}