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(2008). DIDACTIC MATERIALS FOR STUDENTS AS MEANING OF EDUCATIONAL QUALITY IMPROVEMENT. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 7. presented at the June/2008. Retrieved from http://oaji.net/articles/2014/457-1392236443.pdf
(2026). EFFECTS OF A SHORT-TERM TEACHER PROFESSIONAL DEVELOPMENT ON PHYSICS LEARNING UNDER SEVERE RESOURCE CONSTRAINTS: CONCEPTUAL AND SYMBOLIC GAINS WITHOUT PROCEDURAL IMPROVEMENT. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 84(3), Continuous. presented at the June 2026. doi:https://doi.org/10.33225/pec/26.84.480