High temperature electrical conductivity of Zn:Cu:Cl ceramic in phase-transition regionLott, KaljuJournal of optical technology1999 / 7, p. 635-639 Structural, optical, and scintillation characteristics of ZnO ceramicsGorokhova, Elena; Rodnyi, P.; Lokshin, E.; Lott, KaljuJournal of optical technology2011 / p. 753-760 https://www.researchgate.net/publication/249329462_Structural_optical_and_scintillation_characteristics_of_ZnO_ceramics