Institution: | (1) C.N.R.S., Laboratoire de Physique, ENS-Lyon, 46, Allée dItalie, 69364 Lyon, France;(2) Institute for Nuclear Research and Nuclear Energy, Tsarigradsko Chaussee 72, 1784 Sofia, Bulgaria;(3) 7, rue Alexis Carrel, 13004 Marseille, France |