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Molinari, E. and Vergani, Susanna D. and Malesani, D. and Covino, S. and D'Avanzo, P. and Chincarini, G. and Zerbi, F.M. and Antonelli, L.A. and Conconi, P. and Testa, V. and Tosti, G. and Vitali, F. and D'Alessio, F.D. and Malaspina, G. and Nicastro, L. and Palazzi, E. and Guetta, D. and Campana, S. and Goldoni, P. and Masetti, N. and Meurs, E.J.A. and Monfardini, A. and Norci, Laura and Pian, E. and Piranomonte, S. and Rizzuto, D. and Stefanon, M. and Stella, l. and Tagliaferri, G. and Ward, P.A. and Ihle, G. and Gonzalez, L. and Pizarro, A. and Sinclair, P. and Valenzuela, J. (2007) REM observations of GRB060418 and GRB060607A: the onset of the afterglow and the initial fireball Lorentz factor determination. Astronomy & Astrophysics, 469 (1). ISSN 0004-6361