@article{TIMM_2018_24_4_a12,
     author = {V. I. Ivanov},
     title = {Pointwise {Tur\'an} problem for periodic positive definite functions},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {156--175},
     year = {2018},
     volume = {24},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2018_24_4_a12/}
}