@inproceedings{ RUIZ_RICO_CORIAT:846-853,
author = { FRANCISCO RUIZ LÓPEZ and LUIS RICO ROMERO and MOISÉS CORIAT BENARROCH } ,
title = { FREE CHAIN: A GEOMETRICALREPRESENTATION OF THE ADDITIVE OPERATOR ON THE ONE HUNDRED CHART },
booktitle = { ANNUAL MEETING OF THE NORTH AMERICA CONFERENCE FOR THE PSYCHOLOGY OF MATHEMATICS EDUCATION (21.1999.MORELOS, MÉXICO) },
year = { 1999 },
pages = { 846 - 853 },
location = { MORELOS, MÉXICO },
}