Tyurnina, Anastasia V., Morton, Justin A., Subroto, Tungky, Khavari, Mohammad, Maciejewska, Barbara, Mi, Jiawei, Grobert, Nicole, Porfyrakis, Kyriakos, Tzanakis, Iakovos, Eskin, Dmitry G., "Environment friendly dual-frequency ultrasonic exfoliation of few-layer graphene", Carbon, 2021