Bekbaev, U. D., and K. K. Muminov. “On Differential Rational Invariants of the Classical Motion Groups of a Vector Space”. Methods of Functional Analysis and Topology 10, no. 3 (September 25, 2004): 7–10. Accessed December 18, 2025. https://zen.imath.kiev.ua/index.php/mfat/article/view/247.