@inbook {10484,
	title = {von Neumann algebras and unbounded operators (in Greek)},
	booktitle = {Operator Algebras and Quantum Mechanics (Proceedings of the third Summer School in Analysis, Geometry and Mathematican Physics)},
	year = {1997},
	publisher = {Ziti Publishers},
	organization = {Ziti Publishers},
	address = {Thessaloniki },
	author = {Katavolos, A.},
	editor = {Anoussis, M. and S. Kotsakis and N. Hatzisavvas}
}
