@article{MZM_1987_41_3_a5,
     author = {K. V. Safonov},
     title = {Conditions for the sum of a power series to be algebraic and rational},
     journal = {Matemati\v{c}eskie zametki},
     pages = {325--332},
     publisher = {mathdoc},
     volume = {41},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_3_a5/}
}