Santos, R. , Bonifacio, C. , Quesada, D. , Cunha, G. (2016). 'Teaching Material, Books, Publications versus the Practice: Myths and Truths about Installation and Use of Downhole Safety Valve'. World Academy of Science, Engineering and Technology, Open Science Index 120, International Journal of Mechanical and Mechatronics Engineering, 10(12), 1983 - 1988.