Amir A. Mohammed, Beyda S. Abdullah
      ii - open sets in topological spaces
      International Mathematical Forum, Vol. 14, 2019, no. 1, 41-48
      https://doi.org/10.12988/imf.2019.913

Copyright © 2019 Amir A. Mohammed and Beyda S. Abdullah. 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.