@article{SM_2008_199_7_a6,
     author = {A. A. Tolchennikov},
     title = {The kernel of {Laplace-Beltrami} operators
},
     journal = {Sbornik. Mathematics},
     pages = {1071--1087},
     publisher = {mathdoc},
     volume = {199},
     number = {7},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2008_199_7_a6/}
}