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- institute for research and community services universitas muhammadiyah palangkaraya2
- muhammed yildiz2
- taylor & francis ltd2
- universitat politecnica de catalunya2
- hosted by utah state university libraries1
- institute for research and scientific publications stkip singkawang1
- institute of industry and academic research incorporated1
- program studi pendidikan guru madrasah ibtidaiyah1
- stkip singkawang1