Bedratyuk, L. P. (2010). Analog of the Cayley–Sylvester formula and the Poincaré series for an algebra of invariants of ternary form. Ukrains’kyi Matematychnyi Zhurnal, 62(11), 1561–1570. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/2980