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The study is about the quasars' cosmological evolution. We used the medium‐band photometric survey at the 1‐m Schmidt telescope of the Byurakan Astrophysical Observatory. The HS47‐22 field with an area of 2.38 square degrees has been selected. We have classified objects and composed a sample of quasars using broadband photometric data and morphological classification from the DECaLS survey (Dey et...