1. The Graduate School and University Center, The City University of New York, 365 Fifth Avenue, New York, New York 10016 and Physics Department, New York City College of Technology, The City University of New York, 300 Jay Street, Brooklyn, New York 11201
2. Science Department, Borough of Manhattan Community College, The City University of New York, 199 Chambers St., New York, New York 10007 and
LIP, Departamento de Física, Universidade de Coimbra,
3004-516 Coimbra, Portugal