1. M.H. AL-Refaei, (1985) Some Results on Bi-topological spaces. Ph.D. Thesis. Yarmuk University.
2. T. Birsan, An. st. univ. Iasi, s.I.a. Mat. 15, 317–328 (1969).
3. M.K. Bose, et. Al, Etemata ech, 60, 255–259 (2008).
4. On Bitopological Compactness
5. Projective bitopological spaces