ORUKPE, N. O. (2026). A Closed-Form Expression for the Maximum Inclination Angle of Build-and-Hold Directional Well Trajectories: A Unified Formulation Valid for Both r1 > X3 and X3 > r1. Direct Research Journal of Engineering and Information Technology, 14(3), 113-121. https://doi.org/10.4314/drjeit.v14i3.9