1. Multi-agent pathfinding: definitions, variants, and benchmarks;Stern,2019
2. Research challenges and opportunities in multi-agent path finding and multi-agent pickup and delivery problems;Salzman,2020
3. Heuristic search viewed as path finding in a graph;Pohl;Artif. Intell.,1970
4. Structure and intractability of optimal multi-robot path planning on graphs;Yu,2013
5. Lifelong multi-agent path finding for online pickup and delivery tasks;Ma,2017