Ali, D. M., and F. A. Azam. “Some Remarks on Fuzzy <i>R< i><sub>0< sub>, <i>R< i><sub>1< sub> and <i>Regular< I> Topological Spaces”. Journal of Scientific Research, vol. 4, no. 2, Apr. 2012, p. 327, doi:10.3329/jsr.v4i2.6663.