@article{FPM_2002_8_1_a11,
     author = {E. D. Nursultanov and K. S. Saidahmetov},
     title = {On lower bound of the norm of integral convolution operator},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {141--150},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2002_8_1_a11/}
}