Lucio Russo ; with the collaborationof the translator, Silvio Levy. Georg Joos ; with the collaboration of Ira M. Freeman. by Georg Joos ; with the collaboration of IRA M. Freeman. Adelchi Azzalini ; with the collaboration of Antonella Capitanio. by Georg Joos, with the collaboration of Ira M. Freeman. Andr鈋 Weil, with the collaboration of Maxwell Rosenlicht. by V. Kourganoff, with the collaboration of I.W. Busbridge.