@book{13818,
	author = {SPIE Conference on Millimeter and Submillimeter Waves IV and Afsar, Mohammed N., ed.},
	title = {Millimeter and submillimeter waves IV},
	publisher = {The International Society for Optical Engineering},
	year = {1998},
	series = {SPIE proceedings series; vol. 3465},
	address = {Washington}
}