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), pp. 113–121. doi:10.4314/drjeit.v14i3.9.