1. Akiyama, Y., Sengoku, H.,Hiroyuki, T., Shibasaki, R. (2011) Development of Commercial Accumulation Polygon Data Throughout Japan Based on the Digital Classified Telephone Directory. CUPUM2011 (Computers in Urban Planning and Urban Management), F-TC-3(1).
2. Akiyama, Y., Sengoku, H. and Shibasaki, R. (2010) Automatic Detection and Spatio-temporal Analysis of Commercial Accumulations Using Digital Yellow Page Data, World Academy of Science, Engineering and Technology, 66, 122-127.