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5. L. A. Mikheenko, T. A. Grishko, and T. V. Kotlyarenko, “Diffuse emitter of variable brightness based on a matrix of light-emitting diodes with a diffuser,” Vimiryuval’na Obchisl. Tekh. Tekhnol. Protsesakh 1, 74–81 (2013) [in Russian].