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Science 4 April 2008:
Vol. 320. no. 5872, pp. 72 - 77
DOI: 10.1126/science.1153976


Aztec Arithmetic Revisited: Land-Area Algorithms and Acolhua Congruence Arithmetic
Barbara J. Williams, María del Carmen Jorge y Jorge

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Science. ISSN 0036-8075 (print), 1095-9203 (online)