4Plank J, P5llmann K, Zouaoui N, et al. Synthesis and performance of methacrylic ester based polycarboxylate super- plasticizers possessing hydroxy terminated poly (ethylene glycol) side chains[J].Cem Concr Res, 2008,38(10) : 1210.
5Plank J, Sachsenhauser B. Experimental determination of the effective anionic charge density of polycarboxylate superplas- ticizers in cement pore solution[J]. Cem Concr Res,2009,39 (1)..1.