OPTIMIZATION OF THE EXTRACTION PROCESS FROM YELLOW CAMELLIA FLOWERS (CAMELLIA CUCPHUONGENSIS NINH & ROSMANN) COLLECTED IN PHU THO PROVINCE USING RESPONSE SURFACE METHODOLOGY. JMM-NIMM [Internet]. 2026 Apr. 3 [cited 2026 Jun. 23];31(1+2):pp. 96 - 104. Available from: http://tapchiduoclieu.vn:8080/index.php/jomm/article/view/215