Optimizing UAV-UGV coalition operations: A hybrid clustering and multi-agent reinforcement learning approach for path planning in obstructed environment. - Shamyo Brotee; Farhan Kabir; Md. Abdur Razzaque; Palash Roy; Md. Mamun-Or-Rashid; Md. Rafiul Hassan; Mohammad Mehedi Hassan (Ad Hoc Networks, 2024)