DSpace Community: http://repositoriodigital.ipn.mx/handle/123456789/711 Mon, 20 Apr 2026 12:17:54 GMT 2026-04-20T12:17:54Z DSpace Community: https://www.repositoriodigital.ipn.mx:443/retrieve/1284/ http://repositoriodigital.ipn.mx/handle/123456789/711