@article{MZM_1993_54_3_a9,
     author = {I. Yu. Trushin},
     title = {Summability of eigenfunction expansions of differential and integral operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {114--122},
     year = {1993},
     volume = {54},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_54_3_a9/}
}