Indecomposable prefix codes and prime trees. - Maria Gabriella Castelli; Daniela Guaiana; Sabrina Mantaci (Developments in Language Theory, 1997)

Fine and Wilf's Theorem for Three Periods and a Generalization of Sturmian Words. - Maria Gabriella Castelli; Filippo Mignosi; Antonio Restivo (Theor. Comput. Sci., 1999)