Betta, Monica and Laurino, Marco and Pugliese, A. and Guzzetta, Giorgio and Landi, Alberto and Manfredi, Piero  Perspectives on optimal control of Varicella and Herpes Zoster by mass routine varicella vaccination: the effects of Immunity Boosting.  In: 13th Viennese Workshop on Optimal Control and Dynamic Games, May 13-16, 2015, Wien       (Unpublished)   (2015)