1. Effective gelation-delaying additives for Cr+3/polymer gels;Albonico,1993
2. Andresen, K.H., 1946. Method for oil recovery. US Patent 2,402,588.
3. Successful water shut-off. A case study from the Statfjord field;Boreng,1997
4. Gels, monomer solutions fix pinhole casing leaks;Creel;Oil Gas J.,1997
5. Ellfrink, E.B. 1966. Selective plugging method. U.S. Patent 3,261,400.