@article{DAN_1988_300_2_a1,
     author = {Dzh. \`E. Allakhverdiev and R. M. Dzhabarzade},
     title = {Abstract separation of variables},
     journal = {Doklady Akademii Nauk},
     pages = {269--271},
     publisher = {mathdoc},
     volume = {300},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_300_2_a1/}
}