The X-ray to [Ne V]3426 flux ratio: discovering heavily obscured AGN in the distant UniverseR. Gilli, C. Vignali, M. Mignoli, K. Iwasawa, A. Comastri and G. ZamoraniA&A, 519 (2010) A92DOI: https://doi.org/10.1051/0004-6361/201014039
