@book{2628,
	author = {International School of Physics 'Enrico Fermi" Course and Wigner, E.P. ed.},
	title = {Dispersion relations and their connection with causality},
	publisher = {Academic Press},
	year = {1964},
	series = {Proceedings of the International School of Physics Enrico Fermi Course; v. 27},
	address = {New York}
}