Fixed-point and coincidence theorems (topological aspects), Research exposition (monographs, survey articles) pertaining to general topology, selectors, bibliography, integration, Banach's contraction principle, Set-valued functions, operations, measurability, Selections in general topology, Set-valued set functions and measures; integration of set-valued functions; measurable selections, Continuous maps, set-valued maps on continua and partially ordered sets, approximation differentiability, Set-valued maps in general topology, types of continuity, approximative and homological methods