PODOKSENOV, M., and F. GADHIEVA. “AUTOSIMILARITIES AND AUTOISOMETRIC TRANSFORMATIONS OF ONE FOUR-DIMENSIONAL LIE ALGEBRA OF THE VI BIANCHI TYPE”. Vestnik of Polotsk State University. Part C. Fundamental Sciences, no. 4, Apr. 2019, pp. 124-30, https://journals.psu.by/fundamental/article/view/416.