Acknowledgements

Acknowledgements

I would like to thank tbe following persons who have contributed to the realization of this project by sending me comments and introducing me to new resources:

Sheila Anderson, Franco Andreucci, Alberto Baccini, Daniel Boughey, Dennis Brown, Trish Cashen, Mark Dale, Lindy Davies, Giskin Day, James Foreman-Peck, Renato Giannetti, Bill Goffe, Bernard Harris, Len Kloft, Don McCloskey, Roger Middleton, Serge Noiret, Maurizio Oliva, Serena Olsaretti, Morris A. Pierce, Christoph Rass, Bertrand Roehner, Michael J. Smitka, Donald Spaeth, Tom Suydam, Stefano Teri, Robert Wagner.