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Johari, Nur Syafiqah and Ismail, Nor Fariza and Yacob, Nurul Hazirah (2025) Optimisation of soxhlet extraction parameters of hibiscus rosa sinensis using RSM: effects on yield, antioxidant activity, and morphological characteristics. (2025) ESTEEM Academic Journal, 21 (Sept): 10. pp. 119-132. ISSN 2289-4934