1. Handbook of Mathematical Functions With Formulas, Graphs and Mathematical Tables;Abramowitz,1965
2. Installation Loads on Pipelines Installed Using HDD;Baumert,2000
3. Theory and User's Manual,1996
4. Technical Expertise Application of Driscopipe® in Directional Drilling and River Crossings, Technical Note #41,1993
5. Flexible Bars;Frisch-Fay,1962