TY - BOOK AU - 山田, 雅俊 TI - Structure of strong substitutes PB - Faculty of Economics and Osaka School of International Public Policy (OSIPP) Osaka University PY - 1996 T2 - Discussion papers in economics and business VL - 96-05 EP - 21 p. UR - https://ci.nii.ac.jp/ncid/BA34984968 ER -