HETLesion: A hierarchical extended transformer framework for liver lesion segmentation in CT images with XAI. - G. V. Pradeep Kumar; V. Sireesha; V. V. Satyanarayana Tallapragada; Muddamalla Naresh; Alagar Karthick; Vinayagam Mohanavel; E. Parimalasundar (Neurocomputing, 2026)