@article{TRSPY_1987_180_a134,
     author = {R. M. Trigub},
     title = {On the comparison principle for {Fourier} expansions and existence subspaces in the integral metric},
     journal = {Informatics and Automation},
     pages = {219--220},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a134/}
}