"Symposium on 'Combinatorial Structures and their Applications' was held at Villa Madruzzo (Cognola di Trento) , on October 20-25, 1980 ... and sponso...
"Symposium on 'Combinatorial Structures and their Applications' was held at Villa Madruzzo (Cognola di Trento) , on October 20-25, 1980 ... and sponsored by the Centro interuniversitario per la ricerca matematica (C.I.R.C.M.) of the 'Università di Trento'"--Pref.