RT Journal Article SR Electronic T1 Area of a plane triangle JF Science JO Science FD American Association for the Advancement of Science SP 794 OP 794 DO 10.1126/science.ns-2.46.794 VO ns-2 IS 46 A1 B., M. YR 1883 UL http://science.sciencemag.org/content/ns-2/46/794.1.abstract AB