@article{ZNSL_1983_126_a16,
     author = {N. K. Nikol'skii},
     title = {Designs for calculating the spectral multiplicity of orthogonal sums},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {150--159},
     year = {1983},
     volume = {126},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1983_126_a16/}
}