7Kalfoglou George.Surfactants fluid suitable for use in waterflood oil recovery method[P].US 4373711,1982.
8Gale W W.Oil recovery method using a surfactant [P].US 3977471,1976.
9Stewart N J.Preparation of Surfactants[P].US 4764307,1988.
10Moddox Jr Jim,Tate Jack F,et al. Surfactant oil recovery process usable in high temperature formation having high concentrations of polyvalent ion[P]. US 4008165,1977.
