@article{10_4153_CMB_1975_072_8,
     author = {Rao, Aribindi Satyanarayan},
     title = {On {Second-Order} {Differential} {Operators} {With} {Bohr-Neugebauer} {Type} {Property}},
     journal = {Canadian mathematical bulletin},
     pages = {393--396},
     year = {1975},
     volume = {18},
     number = {3},
     doi = {10.4153/CMB-1975-072-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-072-8/}
}