The HELLAS2XMM survey. V. Near-Infrared observations of X-ray sources with extreme X/O ratios
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author: Paolo Ciliegi, Paola Severgnini, Simonetta Puccetti, Silvano Molendi, Lucia Pozzetti, Marcella Brusa, Marco Mignoli, Roberto Maiolino, Andrea Comastri, Fabrizio Fiore, Fabio La Franca, Giuseppe Perola, Giorgio Matt
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