@book {Paschotta_2008,
	title = {Encyclopedia of Laser Physics and Technology},
	year = {2008},
	pages = {844},
	publisher = {Wiley-VCH},
	organization = {Wiley-VCH},
	address = {Berlin},
	isbn = {978-3-527-40828-3},
	author = {R{\"u}diger Paschotta}
}