L. Iziumchenko and A. Tkachevska, “DIFFERENT WAYS OF SOLVING PROBLEMS AS A TOOL FOR FORMING FLEXIBILITY OF THINKING (ON THE EXAMPLE OF A GEOMETRIC PROBLEM)”, Osvìta, ìnnovatika, praktika, vol. 11, no. 9, pp. 48–54, Nov. 2023, doi: 10.31110/2616-650X-vol11i9-007.