Budijono, Stephanie, Jingning Shan, Nan Yao, Yutaka Miura, Thomas Hoye, Robert Austin, Yiguang Ju, and Robert Prud’homme. 2010. “Synthesis of Stable Block-Copolymer-Protected NaYF4:Yb3+, Er3+ Up-Converting Phosphor Nanoparticles”. CHEMISTRY OF MATERIALS 22: 311-18. Referenced from pubs.acs.org: Synthesis of Stable Block-Copolymer-Protected NaYF4:Yb3+, Er3+ Up-Converting Phosphor Nanoparticles.

Ungun, Baris, Robert Prud’homme, Stephanie Budijono, Jingning Shan, Shuang Fang Lim, Yiguang Ju, and Robert Austin. 2009. “Nanofabricated Upconversion Nanoparticles for Photodynamic Therapy”. Optics Express 17: 80-86.