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PASAM JYOTHIRMAYI, DEVALARAO G and MANDAVA VENKATA BASAVESWARA RAO 2019. FORMULATION AND EVALUATION OF MODIFIED ORAL CHRONOTROPIC DRUG DELIVERY SYSTEMS OF TRAMADOL HYDROCHLORIDE FOR RHEUMATOID ARTHRITIS PAIN. Asian Journal of Pharmaceutical and Clinical Research. 12, 7 (Jul. 2019), 120–126. DOI:https://doi.org/10.22159/ajpcr.2019.v12i7.32992.