Klinger, D., & Landfester, K. (2011). Dual Stimuli-Responsive Poly(2-hydroxyethyl methacrylate-co-methacrylic acid) Microgels Based on Photo-Cleavable Cross-Linkers: pH-Dependent Swelling and Light-Induced Degradation. Macromolecules, 44(24), 9758-9772.