@article{MABA_1990_4_3-4_a11,
     author = {Domingo A. Herrero and Zong Y. Wang},
     title = {Quasidiagonal {Operators} in {Tridiagonal} {Algebras}},
     journal = {Mathematica balkanica},
     pages = {337},
     publisher = {mathdoc},
     volume = {4},
     number = {3-4},
     year = {1990},
     url = {http://geodesic.mathdoc.fr/item/MABA_1990_4_3-4_a11/}
}