What nationality of XXX?
Ugo Mulas
New York; the new art scene, Holt, Rinehart and Winston (1967) David Smith in Italy, by David Smith and Mulas, Charta (1997) ISBN 88-8158-024-1 Vent'anni di Biennale, 1954-1972, Mondadori (1988), ISBN 88-04-31254-8 Calder by Mulas and H. Harvard Arnason, Studio (1971), ISBN 0-670-11219-4 Calder by Ugo Mulas, Milan: