Geodesic
Systems of functions with the dual orthogonality property
Matematičeskie zametki, Tome 4 (1968) no. 5, pp. 551-556 
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/
@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},
     year = {1968},
     volume = {4},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_5_a7/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A method is specified for constructing systems of functions with the property of orthogonality with respect to two different sets.