Fabio Alessi Mariangiola Dezani-Ciancaglini Stefania Lusin Intersection types and domain operators. 25-47 2004 316 Theor. Comput. Sci. 1 http://dx.doi.org/10.1016/j.tcs.2004.01.022 db/journals/tcs/tcs316.html#AlessiDL04