Кравец, В. В., А. В. Харченко, and Т. В. Кравец. “PRESENTATION MULTIPLICATIVE COMPOSITIONS WITH FOUR VECTORS BY QUATERNIONIC MATRICES”. Eastern-European Journal of Enterprise Technologies, vol. 5, no. 4(47), Sept. 2010, pp. 15-29, doi:10.15587/1729-4061.2010.3110.