@article{ZNSL_1974_39_a21,
     author = {B. S. Tsirel'son},
     title = {On a~sum of periodic functions and some series with small gaps},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {198--199},
     publisher = {mathdoc},
     volume = {39},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_39_a21/}
}