Ephraim Nissan Giuseppina C. Gini Marco Colombetti Guest editorial: Marco Somalvico memorial issue. 257-264 2008 54 Ann. Math. Artif. Intell. 4 http://dx.doi.org/10.1007/s10472-008-9102-9 db/journals/amai/amai54.html#NissanGC08