Mușinschi, L. and Pricop, V. 2026. The ordinary Hilbert series for Sibirsky graded algebras of the differential system s(5,7). Acta et Commentationes Exact and Natural Sciences. 21, 1 (Jul. 2026), 117-123. DOI:https://doi.org/10.36120/2587-3644.v21i1.117-123.