James A. Quirk, Bin Miao, Bin Feng, Gowoon Kim, Hiromichi Ohta, Yuichi Ikuhara, and Keith P. McKenna, “Unveiling the Electronic Structure of Grain Boundaries in Anatase with Electron Microscopy and First-Pronciples Modeling”, Nano Lett. 2021, 21, 21, 9217–9223