Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DVMG_2020_20_2_a10, author = {V. Ya. Prudnikov}, title = {The problem of separation of variables}, journal = {Dalʹnevosto\v{c}nyj matemati\v{c}eskij \v{z}urnal}, pages = {227--233}, publisher = {mathdoc}, volume = {20}, number = {2}, year = {2020}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DVMG_2020_20_2_a10/} }
V. Ya. Prudnikov. The problem of separation of variables. Dalʹnevostočnyj matematičeskij žurnal, Tome 20 (2020) no. 2, pp. 227-233. http://geodesic.mathdoc.fr/item/DVMG_2020_20_2_a10/