1Tessari, R. M.,Madell, Garret, Warren, Tommy,: "Drilling with casing promises major benefits," Oil and Gas Journal, Vol. 97No. 20, May 17,1999, pp 58 - 62.
3Warren, Tommy M., Angman, Per, and Houtchens, Bruce,:"Casing drilling application design considerations," IADC/SPE 59179, presented at the 2000 IADC/SPE Drilling Conference,New Orleans, February 23 - 25,2000.
4Shepard,S. F. ,Reiley,R. H. ,and Warren,T. M. :"Casing drilling: an emerging technology," IADC/SPE 67731, presented at the 2001 IADC/SPE Drilling Conference, Amsterdam, February 27-March 1,2001.
5Warren, Tommy M.,Houtchens, Bruce, and Portas, W. R ( Bill),Jr. :" Casing drilling with directional steering," two part article published in the January and February 2001 issues of Offshore Magazine.
