María Estela Martínez Cartas de Perón ( born 4 February 1931 ) , better known as Isabel Martínez de Perón ; or Isabel Perón , is a former President of Argentina .
María Estela Martínez Cartas de Perón ( ] ; born 4 February 1931 ) , better known as Isabel Martínez de Perón or Isabel Perón , is a former President of Argentina .