@book{ BA34984968,
author = "山田, 雅俊 ",
title = "Structure of strong substitutes",
publisher = "Faculty of Economics and Osaka School of International Public Policy (OSIPP) Osaka University",
year = "1996",
series = "Discussion papers in economics and business",
number = "96-05",
URL = "https://ci.nii.ac.jp/ncid/BA34984968"
}