Synthesis of Some New Heterocyclic Compounds [(-1,3,4-Oxadiazole), (1,3,4-Oxadiazole-2-Thiol), (1,3,4-Thiadiazole), (1,2,4-Triazin-5-One), (1,2,4-Triazole-3-Thiol)] Containing Fluorine Moiety, Derived from 9H-Fluorene-2-Carboxylic Acid . TUJ-BA 2024, 46 (3), 59-76.