Zhengming Tang, Sanmei Zhang, Tao Hong, Fangyuan Chen, and Kama Huang. “Drastic-Variation Condition of Electric Field and Its Applications in Microwave Heating”. Applied Computational Electromagnetics Society Journal (ACES), vol. 33, no. 05, July 2021, pp. 546-52, https://journals.riverpublishers.com/index.php/ACES/article/view/9165.