Chul-Kyu Lee, Se Yeob Park, Hong Yoon Jung, Chang-Kyu Lee, Byeong-Geun Son, Hyo Jin Kim, Young-Joo Lee, Young-Chang Joo, and Jae Kyeong Jeong, “High performance Zn-Sn-O thin film transistors with Cu source/drain electrode”, Physica status solidi (RRL) – Rapid Research Letters 7(3), 2013 DOI: 10.1002/pssr.201206486.