Modern analysis and applications : the Mark Krein centenary conference, vol. 1: operator theory and related topics / SpringerLink (Online service), 2009 r=on-line. - Текст : электронный.
Modern analysis and applications : the Mark Krein centenary conference, vol. 2: differential operators and mechanics / SpringerLink (Online service), 2009 r=on-line. - Текст : электронный.