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This volume contains the reports presented on the Scientific Conference with international participation MATTEX 2020 held at Konstantin Preslavsky University of Shumen in October 2020. The reports contain the results of the research of lecturers, PhD students, specialists and undergraduate students at Konstantin Preslavsky University of Shumen, other Higher Education Institutions, companies and research organizations. The conference was partially supported by project RD-08-14639/04.02.2020 ofdoi:10.5281/zenodo.4449713 fatcat:ztpmoyc2vnbv7ngafvtk6wajxq