7Benny Poedjono, Guy J. Lombardo, W. Philips. Anti-col- lision Risk Management Standard for Well Placement [ R]. SPE 121040 , 2009.
8Nitin Sharma, Mike McDonald, Jeffrey Mohammed, et al. Optimizing Directional Drilling While Minimizing the Risk of Well Collision in Offshore Drilling [ R ]. SPE124246 , 2009.
