]]> http://bibliotecas.utl.pt/cgi-bin/koha/opac-detail.pl?biblionumber=459392 ISBN 0883857219 http://bibliotecas.utl.pt/cgi-bin/koha/opac-detail.pl?biblionumber=444243 By Nelsen, Roger B.. Washington, DC : Mathematical Association of America, 2000 . xii, 130 p. : 26 cm. 0883857219

]]> http://bibliotecas.utl.pt/cgi-bin/koha/opac-detail.pl?biblionumber=444243 ISBN 0387286594 | 9780387286594 http://bibliotecas.utl.pt/cgi-bin/koha/opac-detail.pl?biblionumber=357486 By Nelsen, Roger B.. New York : Springer, 2006 . xiii, 269 p. : 24 cm.. 0387286594 | 9780387286594

]]> http://bibliotecas.utl.pt/cgi-bin/koha/opac-detail.pl?biblionumber=357486 ISBN http://bibliotecas.utl.pt/cgi-bin/koha/opac-detail.pl?biblionumber=280075 By Fredricks, Gregory A.. 2005 . pp. 42-48

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