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2 Subjects: “...; Jugendlicher; Elektronisches Buch; Individualisierung; Primarbereich; Digitalization; Primary school education...”

3 Subjects: “...; History of arts; Learning to read; Reading Teaching; Elementary School; Primary school; Primary school...”

4 Subjects: “...primary schools...”

5 Subjects: “...primary school students...”

6 Subjects: “..., Secondary school, Primary education, Primary level, Elementary School, Primary school, Primary school lower...”

7 Subjects: “...; Primary school; Language Handicaps; Speech disability; Speech disorder; Speech handicap; Speech Handicaps...”

8 Subjects: “... Forschung, Test, Rasch Analysis, Explorative Studie, Instruction in natural science subjects, Primary school...”

9 Subjects: “...Primary school...”