@book{25676,
	author = {Baarli, J.},
	title = {Proceedings of the International School of Physics ''Enrico Fermi'' :},
	publisher = {North-Helland,},
	year = {c1977.},
	series = {Proceedings ofthe International School of Physics ''Enrico Fermi'' Course LXVI.},
	address = {New York :}
}