Two coincidence theorems in a metric space are proved for a multi-valued mapping that commutes with a single-valued mapping and satisfies a general multivalued contraction type condition.
CHANG, S. S., & PENG, Y. C. (1993). COINCIDENCE POINT THEOREMS FOR MULTIVALUED MAPPINGS. International Journal of Mathematics and Mathematical Sciences, 1993(), 87-94. https://doi.org/10.1155/S0161171293000109