C. . O. Airemwen, I. . E. Jude, A. . P. Uchendu, E. . M. Halilu, and M. . U. Uhumwangho, “Formulation of subcutaneous implantable drug delivery system of ibuprofen using biodegradable polymers”, NIJOPHASR, vol. 10, no. 3, pp. 45–52, Sep. 2021.