Agaân, S. S., & Matevosân, A. K. (1981). Obobŝennye preobrazovaniâ Haara i avtomatičeskie sistemy proverki kačestva pečatnyh plat. Acta Cybernetica, 5(3), 345-362. Retrieved from https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3223