Zhao, Q. et al. 2014. Acrylamide/2-Acrylamido-2-methylpropanesulfonic acid/1-Vinyl-2-pyrrolidinone Terpolymeric Microspheres by Orthogonal Experiments. Asian Journal of Chemistry. 26, 17 (Aug. 2014), 5615–5618. DOI:https://doi.org/10.14233/ajchem.2014.18168.