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3. 3. A.V. Bushma, G.A. Sukach, Light-Emitting Diode Position Scale - a Highly Efficient Tool for Representation of Information in Metrology // Measurement Techniques, 45 (5), p. 494-499 (2002).
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5. 5. F.M. Yablonsky, Yu.V. Troitsky, Information Imaging Tools. Vysshaya shkola, Moscow, 1985 (in Russian)