Deng, Yi, Bo Li, Qinjian Yin, and Bo Jiang. 2012. “Janus-Like Hollow Polymer Spheres Prepared from Emulsion Droplets by the Solvent Evaporation Method”. Asian Journal of Chemistry 24 (10):4701-4. https://asianpubs.org/index.php/ajchem/article/view/9604.