Tajmouati, A., M. Amouch, M.R.F. Alhomidi Zakariya, and M. Abkari. 2017. “SUBSPACE MIXING AND UNIVERSALITY CRITERION FOR A SEQUENCE OF OPERATORS”. Italian Journal of Pure and Applied Mathematics 37 (January):339-46. https://journals.uniurb.it/index.php/ijpam/article/view/6705.