By Khabibullin I. T.   Gudkova E. V.   in Functional Analysis and Its Applications

ISSN:0016-2663|38|2|138-148

Springer Publishing Company ‎(2004)‎

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By Khabibullin I.   Sazonov S.   Sunyaev R.   in Monthly Notices of the Royal Astronomical Society

ISSN:0035-8711|426|3|1819-1828

Oxford University Press‎(2012)‎

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