PATHAK, H. K, Y. J. CHO, S. S. CHANG, and S. M. KANG. 1995. “COINCIDENCE POINT THEOREMS FOR MULTI-VALUED AND SINGLE-VALUED MAPPINGS IN MENGER PM-SPACES”. Tamkang Journal of Mathematics 26 (4):313-19. https://doi.org/10.5556/j.tkjm.26.1995.4410.