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		Syam, M., 		Muliarta, I., 		Irfan, M., 		Adiputra, N., 		Weta, W., & 		Imron, A.
(2018).
 PERBANDINGAN EFEKTIVITAS KONTRAKSI (25%, 50% DAN 75%) DARI NILAI KONTRAKSI MAKSIMAL PADA TEKNIK CONTRACT RELAX TERHADAP PENINGKATAN FLEKSIBILITAS OTOT HAMSTRING.
<em>Sport And Fitness Journal, </em>.
doi:10.24843/spj.2018.v06.i01.p03