Hitoshi Kono, Tsuyoshi Suzuki, Akiya Kamimura, Kohji Tomita, Yusuke Tamura, Atsushi Yamashita, and Hajime Asama, Automatic Convergence Estimation by Utilizing Fractal Dimensional Analysis for Reinforcement Learning, The Journal of Instrumentation, Automation and Systems, vol. 3, Issue 3, pp.58-70, 2016 (available online in 2017). DOI:http://dx.doi.org/10.21535/jias.v3i3.934