Detecting API Usage Patterns from Software Repositories Using Method Categorization. - Rizky Januar Akbar; Takayuki Omori; Katsuhisa Maruyama (JCKBSE, 2012)

Spline and color representation for batik design modification. - Nanik Suciati; Anny Yuniarti; Chastine Fatichah; Rizky Januar Akbar (IC3INA, 2013)

Mining API Usage Patterns by Applying Method Categorization to Improve Code Completion. - Rizky Januar Akbar; Takayuki Omori; Katsuhisa Maruyama (IEICE Trans. Inf. Syst., 2014)