Sustainability of a pay-as-you-go pension system by dynamic immigration control. - Massimo Angrisani; Anna Attias; Sergio Bianchi; Zoltán Varga (Appl. Math. Comput., 2012)

Dynamic immigration control improving inverse old-age dependency ratio in a pay-as-you-go pension system. - Augusto Pianese; Anna Attias; Zoltán Varga (Decis. Support Syst., 2014)