Sid Ahmed, Ould Ahmed Mahmoud. 2018. “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):438-63. https://journals.uniurb.it/index.php/ijpam/article/view/7005.