Takayama, T. , Kikuchi, S. , Hashimoto, Y. , Ikeda, T. , Murata, Y. (2007), 'Extended “2D-RIB“ for Impression-Based Satisfactory Retrieval and its Evaluation ', World Academy of Science, Engineering and Technology, Open Science Index 3, International Journal of Computer and Information Engineering, 1(3), 738 - 744.