Ficarra, AntoninoAntoninoFicarraNANNI, MAUROMAURONANNIPadrielli, LuciaLuciaPadrielli2020-06-012020-06-011981http://hdl.handle.net/20.500.12386/25386StampaitTechnical reporthttp://www.ira.inaf.it/Library/rapp-int-2004/63-81.pdf