@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 },

}