N. Senniangiri, V. Purusothaman, A. Ramakrishnan, K. Ramprakash and S. Shanthakumar 2018. Design and analysis in drill offset using root cause analysis . International journal of intellectual advancements and research in engineering computations. 6, 1 (Mar. 2018), 651–654. DOI:https://doi.org/10.61096/ijiarec.v6.iss1.2018.651-654.