Tomoko Iwata, Tatsuya Matsumoto. Global-to-Diffuse Illuminance Conversion Model. Proceedings, 3rd Lighting Symposium of China, Japan and Korea. 2010. 299-300
Tomoko Iwata, Norio Igawa, Tatsuya Matsumoto. Applying Luminous Environment Design by Estimating Diffuse and Direct Illuminances. Proceedings of CIE 2010 "Lighting Quality & Energy Efficiency". 2010. 676-679
Tomoko Iwata, Norio Igawa. A Method to Estimate Diffuse Horizontal Illuminance and Direct Solar Illuminance Based on Global Horizontal Illuminance. Proceedings of the 6th Lux Pacifica. 2009. 87-92
Tomoko Iwata, Matsuzawa, Norio Igawa, Yasuko Koga, Ken Anai. Meteorological Data on Daylight and Solar Radiation for Environmental Design Applications Part 2 A Comparison of Luminous Efficacy Models with Measured Data from Kitakyushu, Japan. Proceedings of the 5th Lux Pacifica. 2005. 61-65
Norio Igawa, Tomoko Iwata, Matsuzawa. Meteorological Data on Daylight and Solar Radiation for Environmental Design Applications Part 1 Sky models and daylight luminous efficacies. Proceedings of the 5th Lux Pacifica. 2005. 56-60