@article{CHFMJ_2019_4_4_a2,
     author = {N. B. Medvedeva and V. A. Viktorova},
     title = {An approximate calculation},
     journal = {\v{C}el\^abinskij fiziko-matemati\v{c}eskij \v{z}urnal},
     pages = {398--411},
     year = {2019},
     volume = {4},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHFMJ_2019_4_4_a2/}
}