Provider: Japan Science and Technology Agency Database: J-STAGE Content:text/plain; charset="utf-8" TY - JOUR TI - title_in_Japanese TI - JO - JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN VL - 70 IS - 1 SP - plate1 EP - plate8 PY - 1986 DO - 10.2150/jieij1980.70.1_plate1 ER -