Ilash N. Poincare series for the algebras of joint invariants and covariants of $n$ quadratic forms. Carpathian Math. Publ. [Internet]. 2017 Jun. 7 [cited 2024 Nov. 21];9(1):57-62. Available from: https://ktipe.pnu.edu.ua/index.php/cmp/article/view/1447