Linear operators in spaces with an indefinite metric - Azizov, Tomas Jakovlevič; Iochvidov, Iosif S. 1919-1984 (Wiley, 1989)
Aus d. Russ. übers. - Literaturverz. S. 286 - 300. - EST: Osnovy teorii lineynykh operatorov v prostranstvakh s indefinitnoy metrikoy <engl.>