Exploring the active galactic nuclei population with extreme X-ray-to-optical flux ratios (fx/fo > 50)

SM and FJC acknowledge financial support by the Spanish Ministry of Economy and Competitiveness through grants AYA2010-21490-C02-01 and AYA2012-31447 and from the ARCHES project, funded by the 7th Frameworkof the European Union (project no. 313146). AR acknowledgesfinancial support by the Spanish Ministry of Economy and Competitiveness through grant AYA2012-31447

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