@article{MZM_1974_15_2_a19,
     author = {S. V. Zotikov},
     title = {Cross products of complete orthonormal systems of functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {331--340},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_2_a19/}
}