Ong, Lee-Loon, Ah-Choo Koo, Yi-Fei Tan, Wooi-Nee Tan, and Forest Yan-Peng Lim. 2012. “SymmeGuess: Fun Beyond Symmetry Learning”. International Journal on Advanced Science, Engineering and Information Technology 2 (6):468-71. https://doi.org/10.18517/ijaseit.2.6.246.