@article{ASUO_2013_XXI_2_a11,
     author = { Xiang Gao },
     title = { A necessary and sufficient condition for some steady {Ricci} solitons
                            to have positive asymptotic volume ratio },
     journal = {Analele Universit\u{a}\c{t}ii "Ovidius" Constan\c{t}a Seria Matematic\u{a}},
     publisher = {mathdoc},
     volume = {XXI},
     number = {2},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/ASUO_2013_XXI_2_a11/}
}