@article{UFA_2019_11_3_a6,
     author = {H. El-Azhar and K. Idrissi and E. H. Zerouali},
     title = {Weak positive matrices and hyponormal weighted shifts},
     journal = {Ufa mathematical journal},
     pages = {88--98},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2019_11_3_a6/}
}