Nitit FS, Suwardi S, Hanafi S. Application of Service Duel Approach to Improve High Secondary School Students’ Badminton Backhand Serve Accuracy . IJRER [Internet]. 2026 Sep. 5 [cited 2026 Sep. 13];6(1):294-30. Available from: https://etdci.org/journal/ijrer/article/view/5179