Ladzoryshyn, N. B., and V. M. Petrychkovych. “The Number of Standard Forms of Matrices over Imaginary Euclidean Quadratic Rings With Respect to the $(z,k)$–equivalence”. Matematychni Studii, Vol. 57, no. 2, June 2022, pp. 115-21, doi:10.30970/ms.57.2.115-121.