Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Marco Riccardi. Heron's Formula and Ptolemy's Theorem. Formalized Mathematics, 16(1-4):97-101, 2008. [doi]