Effect of clonidine on the circulation and vasoactive hormones after aortic surgery. - Quintin,L.; Roudot,F.; Roux,null.C.; Macquin,I.; Basmaciogullari,A.; Guyene,T.; Vaubourdolle,M.; Viale,J.P.; Bonnet,F.; Ghignone,M. (Br. J. Anaesth., 1991)