@book{1307,
	author = {Schaumann, Rolf, and Van Valkenburg, M. E.},
	title = {Design of analog filters /},
	publisher = {Oxford University Press,},
	year = {2001.},
	address = {New York :},
	note = {Rev. ed. of: Analog filters design / M.E. Van Valkenburg. c1982.},
	url = {http://www.loc.gov/catdir/enhancements/fy0603/99035428-t.html}
}