English: Ecological studies on Japanese encephalitis in Osaka Prefecture : 1. Decrease of the paddy field area and the number of livestock breeding farms in relation to incidence of human cases during 1965-1986
Japanese: 大阪府における日本脳炎の生態学的研究 : 1. 水田面積, 家畜飼育農家戸数の減少と患者の発生状況