Rivera, Juan2017-09-252017-09-251996http://revistas.pucp.edu.pe/index.php/promathematica/article/view/6075/6081application/pdfspainfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0EsferaTeoremainfo:eu-repo/semantics/articlehttps://purl.org/pe-repo/ocde/ford#1.01.00