@article{SM_1987_56_2_a4,
     author = {A. A. Grigor'yan},
     title = {On the existence of positive fundamental solutions of the {Laplace} equation on {Riemannian} manifolds},
     journal = {Sbornik. Mathematics},
     pages = {349--358},
     publisher = {mathdoc},
     volume = {56},
     number = {2},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1987_56_2_a4/}
}