ORUKPE, Nelson 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): 113-21. https://doi.org/10.4314/drjeit.v14i3.9.