Toptsis, A. A., R. A. Chaturvedi, and A. Feroze. “Kohonen-Guided Parallel Bidirectional Voronoi-Assisted Heuristic Search ”. International Journal of Advanced Science and Technology, Vol. 23, Dec. 2017, pp. 15 -34, http://sersc.org/journals/index.php/IJAST/article/view/60.