@book{568786,
	author = {Gribbin, John and Gribbin, Mary},
	title = {Newton (1642-1727) in 90 minutes /},
	publisher = {Constable,},
	year = {1997.},
	address = {London :},
	url = {http://www.gbv.de/dms/goettingen/224763326.pdf}
}