1. A new descriptive method of instataneous fetal heart rate progressions for computer simulation (in Japanese);Koyanagi;Shusankiigaku,1982
2. An analysis of the regulatory mechanisms in fetal heart rate changes, using a mathematical analysis-model;Koyanagi;Acta Obstet Gynecol Jpn,1983
3. Fetal growth curve of Japanese;Nishida;Acta Neonat Jap,1984