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| <ref name="r2" >Zaba, J. 1962. ''Modern Oil Well Pumping''. Tulsa, Oklahoma: Petroleum Publishing Co. </ref> | | <ref name="r2" >Zaba, J. 1962. ''Modern Oil Well Pumping''. Tulsa, Oklahoma: Petroleum Publishing Co. </ref> |
| <ref name="r3" >Donnelly, R.W. 1986. ''Oil and Gas Production: Beam Pumping''. Dallas, Texas: PETEX, University of Texas. </ref> | | <ref name="r3" >Donnelly, R.W. 1986. ''Oil and Gas Production: Beam Pumping''. Dallas, Texas: PETEX, University of Texas. </ref> |
| <ref name="r4" >Saber, T. 1993. ''Modern Sucker Rod Pumping''. Tulsa, Oklahoma: PennWell Books. </ref> | | <ref name="r4" >Takacs, G. 1993. ''Modern Sucker Rod Pumping''. Tulsa, Oklahoma: PennWell Books. </ref> |
| <ref name="r5" >Frick, T.C. 1962. ''Petroleum Production Handbook'', Vol. 1 . Dallas, Texas: Society of Petroleum Engineers. </ref> | | <ref name="r5" >Frick, T.C. 1962. ''Petroleum Production Handbook'', Vol. 1 . Dallas, Texas: Society of Petroleum Engineers. </ref> |
| <ref name="r6" >Bradley, H.B. 1987. ''Petroleum Engineering Handbook''. Richardson, Texas: SPE. </ref> | | <ref name="r6" >Bradley, H.B. 1987. ''Petroleum Engineering Handbook''. Richardson, Texas: SPE. </ref> |