“Effect of Hydrophile-Lipophile Balance (HLB) of Mixed Surfactants on In-Vitro Release Profile of Ibuprofen from Semi-Synthetic Suppository Bases”. Nigerian Journal of Pharmaceutical Research, vol. 17, no. 1, Aug. 2021, pp. 109-17, https://doi.org/10.4314/njpr.v17i1.12.