http://catalogo.fi.uba.ar/cgi-bin/koha/opac-search.pl?q=ccl=an%3A18650%20and%20au%3AVelasco%20Coba%2C%20Federico&format=rss2 2 0 50 ISBN 9682401712 http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=4945 México : Trillas, 1988 . 62 p. : , Tít. orig.: Topics in mathematics for elementary school teachers. Booklet number 18, symmetry congruence and similarity 23 cm. 9682401712

]]> http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=4945 ISBN 9682401674 http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=4949 México : Trillas, 1988 . 84 p. : , Tít. orig.: Topics in mathematics for elementary school teachers. Booklet number 14, informal geometry 23 cm. 9682401674

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