2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4036We report on optical and near-infrared (NIR) follow-up spectroscopy of faint far-infrared (FIR) sources found in our deep FIR survey by Kawara et al.2 pages, 1 figure. To appear in the proceedings of "AGN Surveys" (IAU Colloquium 184)AstrophysicsThe Nature of the faint far-infrared extragalactic source population: Optical/NIR and radio follow-up observations of ISOPHOT deep-field sources using Keck, Subaru, and VLA telescopestext