Signal, Image, or Symbolic: Exploring the Best Input Representation for Electrocardiogram-Language Models Through a Unified Framework. - William Han; Chaojing Duan; Zhepeng Cen; Yihang Yao; Xiaoyu Song; Atharva Mhaskar; Dylan Leong; Michael A. Rosenberg; Emerson Liu; Ding Zhao (CoRR, 2025)