Yu, Yueqin, Hongjie Tian, and Xianzhi Chang. 2010. “Synthesis and Characterization of P(NIPAAm-Co-AAc) Hydrogels With L-Lysine-Cross-Linker”. Asian Journal of Chemistry 20 (6):4803-12. https://asianpubs.org/index.php/ajchem/article/view/19097.