@article{10_1017_S0017089500001506,
     author = {Lo, Chi Yeung},
     title = {Boundary value problems of singular elliptic partial differential equations},
     journal = {Glasgow mathematical journal},
     pages = {111--118},
     year = {1972},
     volume = {13},
     number = {2},
     doi = {10.1017/S0017089500001506},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500001506/}
}