Yanshyna, Oksana, et al. “Coexistence of 1:1 and 2:1 Inclusion Complexes of Indigo Carmine.”10.1039/d1cc07081a__Chemical Communications, vol. 58, no. 21, Royal Society of Chemistry, 2022, pp. 3461–64, doi:10.1039/d1cc07081a.

Lee, Ji-Woong, and Rafal Klajn. “Dual-Responsive Nanoparticles That Aggregate under the Simultaneous Action of Light and CO2.”10.1039/c4cc08541h__Chemical Communications, vol. 51, no. 11, Royal Society of Chemistry, 2015, pp. 2036–39, doi:10.1039/c4cc08541h.