6Ray T. Oskarsen, John W. Wright. Rotating Magnetic Ranging Service and Single Wire Guidance Tool Facili- tates in Efficient Down- hole Well Connections[ J]. So- ciety of Petroleum Engineers, 2009 (5) : 17 - 19.
7Oskarsen Ray. T,Wright John. W. Down - hole well con- nections by use of rotating - magnetic - ranging - Service and single - wire - guidance tool ( J). Journal of Petroleum Technology, 2009 ( 5 ) : 75,77,82.