NITIT, Fransiskus Saferius; SUWARDI, Suwardi; HANAFI, Suriah. Application of Service Duel Approach to Improve High Secondary School Students’ Badminton Backhand Serve Accuracy . ETDC: Indonesian Journal of Research and Educational Review , [S. l.], v. 6, n. 1, p. 294–304, 2026. DOI: 10.51574/ijrer.v6i1.5179. Disponível em: https://www.etdci.org/journal/ijrer/article/view/5179. Acesso em: 22 sep. 2026.