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Sruthi R., Biju C. R., Jyotisree G., Amita S. Menon, Ayswarya K., Babu G. Formulation, Evaluation and HPTLC Analysis of Topical Ointment Containing Calendula officinalis and Echinacae purpurae Mother Tinctures. Int. j. res. appl. sci. biotechnol. [Internet]. 2020 Nov. 30 [cited 2024 Nov. 23];7(6):78-84. Available from: https://ijrasb.com/index.php/ijrasb/article/view/299