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		Syam, M., 		Muliarta, I., 		Irfan, M., 		Adiputra, N., 		Weta, W., & 		Imron, A.
2018 Jan 12.  PERBANDINGAN EFEKTIVITAS KONTRAKSI (25%, 50% DAN 75%) DARI NILAI KONTRAKSI MAKSIMAL PADA TEKNIK CONTRACT RELAX TERHADAP PENINGKATAN FLEKSIBILITAS OTOT HAMSTRING. Sport and Fitness Journal. [Online] :