@article{DAN_1983_272_1_a4,
     author = {I. E. Kaporin},
     title = {A fast algorithm for a class of unitary transforms},
     journal = {Doklady Akademii Nauk},
     pages = {23--26},
     publisher = {mathdoc},
     volume = {272},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_272_1_a4/}
}