Issues in relation to which referendums are mandatory at the national level

Argentina
Constitution of the Argentinian Nation (Constituciónde la Naci?n Argentina)
http://aceproject.org/ero-en/regions/americas/AR/argentina-constitucion-de-la-nacion-argentina-2012
Law 24.747 onAgenda initiative (1996-11-27) [Ley 24.747 Iniciativa legislativa popular]
Law 25.432 onReferendum (2001-05-23) [Ley 25.432 Consulta popular vinculante y novinculante]
http://infoleg.mecon.gov.ar/infolegInternet/anexos/65000-69999/67518/norma.htm
Legislation does not provide for mandatory referendums