Leucippus
Links
Leucippus
http://www.philosophyclassics.com/philosophers/Leucippus/
Brief article on this early Greek atomist thinker, from the 1911 Encyclopaedia Britannica.
Leucippus
http://www.utm.edu/research/iep/l/leucippu.htm
Internet Encyclopedia of Philosophy article, detailing Leucippus' theory of atoms.
MacTutor History of Mathematics: Leucippus of Miletus
http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Leucippus.html
Biographical article by J.J. O'Connor and E.F. Robertson, with links to related topics.