@article{SIGMA_2020_16_a77,
     author = {Jiayin Pan},
     title = {The {Fundamental} {Groups} of {Open} {Manifolds} with {Nonnegative} {Ricci} {Curvature}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2020},
     volume = {16},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2020_16_a77/}
}