An extensive review of some of the more important neutral organophosphorus compounds as solvent extractants was given. The compounds included were tri-n-butyl phosphate, TBP, tri-n-octylphosphine oxide, TOPO, tris (2 -ethylhexyl)phosphine oxide, TEHPO, and bis (di-n-hexylphosphinyl) methane, HDPM. A review was also given on the effects of structure on the extracting power of neutral organophosphorus compounds.
Parker, James Roger and Banks, C. V., "Some bis(dialkylphosphinyl) methanes as solvent extractants" (1964). Ames Laboratory Technical Reports. 72.