CIT-HAR: A High Accuracy and Lightweight Human Activity Recognition System Using CSI Heatmaps and a Hybrid Transformer Network. - Weiguang Shi; Yinfeng Tang; Yu Cao 009; Wanru Ning; Haoyuan Jiang; Yongtao Ma; Di Wang; Mingjun Ding (IEEE Trans. Instrum. Meas., 2025)