Raheem, F. A., and U. I. Hameed. “Path Planning Algorithm Using D* Heuristic Method Based on PSO in Dynamic Environment”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 49, no. 1, Dec. 2018, pp. 257-71, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/4515.