Zhongzhou Du, Yi Sun, Oji Higashi, Yuki Noguchi, Keiji Enpuku, Sebastian Draack, Klaas-Julian Janssen, Tamara Kahmann, Jing Zhong, Thilo Viereck, Frank Ludwig and Takashi Yoshida, Effect of core size distribution on magnetic nanoparticle harmonics for thermometry, Japanese Journal of Applied Physics, 59, 010904 (2019).