@article{MZM_1971_10_1_a13,
     author = {Ya. I. Shatyro},
     title = {Smoothness of solutions of certain singular second-order equations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {101--111},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_1_a13/}
}