P. O. OBETA and E. SAMUEL, “Rheological Evaluation of Mucuna sloanei (Ukpo) as a Sustainable Bio-Polymer Viscosifier for Water-Based Drilling Fluids in Nigeria”, Direct Res. J. Eng. Inform. Tech., vol. 14, no. 1, pp. 150–159, Apr. 2026, doi: 10.26765/DRJEIT176147853.