Geodesic
On the subnormal elements in $C^{\ast}$-algebras
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (1992), pp. 34-40 
M. I. Karakhanyan. On the subnormal elements in $C^{\ast}$-algebras. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (1992), pp. 34-40. http://geodesic.mathdoc.fr/item/UZERU_1992_1_a4/
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Voir la notice de l'article provenant de la source Math-Net.Ru

The subnormal element concept is introduced in $C^{\ast}$-algebra and characterised in terms of positive definition based on the dilatation theorem holding on the Hilbert $A$-modules.

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