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- universitas pahlawan tuanku tambusai7
- universitas pendidikan indonesia kampus serang6
- american institute of physics4
- pagepress4
- diponegoro university; association of indonesian coastal management experts3
- laboratory of elementary teacher education study program, faculty of education and teacher training, universitas riau pekanbaru, indonesia3
- state islamic university sunan kalijaga3
- universitas negeri medan3
- diponegoro university2