Propagation Characteristics of Microstrip Lines (MTLS) with Defected Ground Structure Slots: Theory and Application. - Haiwen Liu; Lingling Sun; Zhengfan Li; Xiaowei Sun (J. Circuits Syst. Comput., 2007)

Modeling learning behaviors and predicting performance in an intelligent tutoring system: a two-layer hidden Markov modeling approach. - Yun Tang 004; Zhengfan Li; Guoyi Wang; Xiangen Hu (Interact. Learn. Environ., 2023)