Symmetry and Asymmetry in Pre-Trained Transformer Models: A Comparative Study of TinyBERT, BERT, and RoBERTa for Chinese Educational Text Classification. - Munire Muhetaer; Xiaoyan Meng; Jing Zhu; Aixiding Aikebaier; Liyaer Zu; Yawen Bai (Symmetry, 2025)