External effective dose from natural radiation for the Umbria region (Italy) by Kassandra Giulia Cristina Raptis, Matteo Albéri, Stefano Bisogno, Ivan Callegari, Enrico Chiarelli, Luca Cicala, Tommaso Colonna, Mario De Cesare, Enrico Guastaldi, Andrea Maino, Fabio Mantovani, Michele Montuschi, Andrea Motti, Norman Natali, Marco Ogna, Filippo Semenza, Andrea Serafini, Gianluigi Simone, Virginia Strati

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