Diffusion-Aided RAG: Elevating Dense-Retrieval Chatbots via Graph-Based Diffusion Reranking. - Sai Teja Dampanaboina; Sai Nishchal Gamini; Karishma Kunwar; Marco Polignano; Marco Levantesi; Giovanni Semeraro; Ernesto William De Luca (CLiC-it, 2025)