A. Abdollahi
      On the numerical ranges of a tridiagonal operators
      International Journal of Mathematical Analysis, Vol. 8, 2014, no. 36, 1785-1789
      http://dx.doi.org/10.12988/ijma.2014.47198

Copyright © 2014 A. Abdollahi. This article is distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.