1. Survey of Applicable Mathematics;Rektorys,1969
2. Elementary Differential Equations;Boyce,1969
3. Designing well paths to reduce drag and torque;Sheppard;SPE Drilling Engineering,1987
4. Helical buckling of tubing sealed in packers;Lubinski;Journal of Petroleum Technology,1962
5. Theory of Elastic Stability;Timoshenko,1961