1. Angel, M., Negele, A., 1999. Utilization of vinyl formamide homopolymers or copolymers for inhibiting gas hydrates (verwendung von homo- oder copolymerisaten des vinylformamids zur inhibierung von gashydraten). WO Patent 9 964 717, assigned to BASF AG, December 16, 1999.
2. Angel, M., Neubecker, K., Sanner, A., 2001. Grafted polymers as gas hydrate inhibitors [pfropfpolymerisate als gashydratinhibitoren]. WO Patent 0 109 271, assigned to BASF AG, February 08, 2001.
3. Anselme, M.J., Reijnhout, M.J., Muijs, H.M., Klomp, U.C., 1993. A method for inhibiting gas hydrate formation. WO Patent 9 325 798, assigned to Shell Canada Ltd. and Shell Int. Research, December 23, 1993.
4. The formation of hydrates in oil-water systems;Avlonitis,1989
5. Chart gives hydrate formation temperature for natural gas;Baillie;Oil Gas J.,1987