https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Balbuena%2C%20Hugo%2C%22&sort_by=title_az&format=rss 4 0 50 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=65514 By Balbuena, Hugo.
México .
10-15

]]> Place hold on De los saltos de rana a la propiedad de densidad de los números racionales

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=65514 ISBN: https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=14509 México : IPN, Centro de Investigación y de Estudios Avanzados, 1984 .
28 p. :

]]> Place hold on Descubriendo las fracciones /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=14509 ISBN:9682942500 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=14955 ]]> By Block Sevilla, David.
México : CONAFE, 1992 .
271 p. : 9682942500

]]> Place hold on Dialogar y descubrir :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=14955 ISBN:9682953324 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=106393 ]]> By Block Sevilla, David.
México : SEP, 1993 .
47 p. 9682953324

]]> Place hold on Primaria :

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=106393