Geodesic
Strong integral operators
Matematičeskie zametki, Tome 16 (1974) no. 6, pp. 907-912 
V. B. Korotkov. Strong integral operators. Matematičeskie zametki, Tome 16 (1974) no. 6, pp. 907-912. http://geodesic.mathdoc.fr/item/MZM_1974_16_6_a6/
@article{MZM_1974_16_6_a6,
     author = {V. B. Korotkov},
     title = {Strong integral operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {907--912},
     year = {1974},
     volume = {16},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_6_a6/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is shown that a strong integral (strong B-integral) operator in $L_2$ is a Hilbert–Schmidt (nuclear) operator.