1. Payne K. L.(Big Three Industries Inc. A TX CORP Big Three Industries Inc.) U.S. Pat. US4579670A (1986).
2. He J.;W C. D.;Wang M. X.;Wu J. Q.;Li S. Q.;Zhan Z. Y.;Wu C. Y.;Liu C.;Fang X.(Shaanxi Yanchang Petroleum [Group] Co. Ltd. Research Institute) China Pat. CN104194764A (2014).
3. Li L.(Schlumberger Technology Corp.) U.S. Pat. US7857055B2.
4. Ihejirika B.;Dosunmu A.;Eme C. In SPE Nigeria Annual International Conference and Exhibition Lagos Nigeria 2015/8/4/ 2015 SPEpp 11.