@article{PFMT_2018_3_a1,
     author = {N. A. Akhramenko},
     title = {The field of gravity of a massive spherical shell},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {19--22},
     publisher = {mathdoc},
     number = {3},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2018_3_a1/}
}