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@article{MZM_1968_4_5_a7, author = {I. F. Krasichkov}, title = {Systems of functions with the dual orthogonality property}, journal = {Matemati\v{c}eskie zametki}, pages = {551--556}, publisher = {mathdoc}, volume = {4}, number = {5}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_5_a7/} }
I. F. Krasichkov. Systems of functions with the dual orthogonality property. Matematičeskie zametki, Tome 4 (1968) no. 5, pp. 551-556. http://geodesic.mathdoc.fr/item/MZM_1968_4_5_a7/