Volkov М.А. and Osetrov В.Г. 2019. Technology of Processing Parts with Square and Rectangular Holes. Vestnik IzhGTU imeni M.T. Kalashnikova. 21, 4 (Feb. 2019), 22–27. DOI:https://doi.org/10.22213/2413-1172-2018-4-22-27.