Sid Ahmed, Ould Ahmed Mahmoud. “ON THE JOINT (m, Q)-PARTIAL ISOMETRIES AND THE JOINT M- INVERTIBLE TUPLES OF COMMUTING OPERATORS ON A HILBERT SPACE”. Italian Journal of Pure and Applied Mathematics 40 (July 31, 2018): 438–463. Accessed October 7, 2026. https://journals.uniurb.it/index.php/ijpam/article/view/7005.