Artem Lopatin, “Indecomposable orthogonal invariants of several matrices over a field of positive characteristic”, Int. J. Algebra Comput., 31, № 01, 2021, 161
A.A. Lopatin, “Free relations for matrix invariants in the modular case”, Journal of Pure and Applied Algebra, 216, № 2, 2012, 427
Artem Lopatin, “Minimal system of generators for O(4)-invariants of two skew-symmetric matrices”, Linear and Multilinear Algebra, 66, № 2, 2018, 347