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Erturk, S. , Eyigel, L. , Celik, C. , Sahinoglu, M. , Ay, S. , Kaya, Y. , Kaya, H.. "Evaluation of Manual and Automatic Calibration Methods for Digital Tachographs". World Academy of Science, Engineering and Technology, Open Science Index 151, International Journal of Transport and Vehicle Engineering (2019), 13(7), 484 - 487.