by Elbio Dagotto
by U. M�ller, L. B�hler
by T. Nieuwenhuis
by Renzo L. Ricca
by Edward M. Purcell, David J. Morin
by J. L. Burch
by Ruth W. Chabay
by Michael Scott-Baumann
by Roscoe B. White
by Rosemarie Tong
by Norberto Majlis
by Lee Carroll