On some classes of Operators on Hilbert spaces
Δελτίο της Ελληνικής Μαθηματικής Εταιρίας , Tome 14 (1973), p. 15-18.

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     author = {I. Istratescu},
     title = {On some classes of {Operators} on {Hilbert} spaces},
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},
     pages = {15-18},
     publisher = {mathdoc},
     volume = {14},
     year = {1973},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/DEME_1973__14_a2/}
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I. Istratescu. On some classes of Operators on Hilbert spaces. Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
, Tome 14 (1973), p. 15-18. http://geodesic.mathdoc.fr/item/DEME_1973__14_a2/