@article{lejpt30039,
 author={Oriji, B. A. and Marcus, N. M.},
 year={2017},
 title={An accurate estimation and optimization of bottom hole back pressure in managed pressure drilling},
 journal={Leonardo Electron. J. Pract. Technol.},
 volume={16},
 number={30},
 pages={39-58},
 url={http://lejpt.academicdirect.org/A30/039_058.pdf}
}