@article{oai:u-ryukyu.repo.nii.ac.jp:02006992, author = {Uehara, Yosei}, issue = {21}, journal = {琉球大学理工学部紀要. 理学編, Bulletin of Science & Engineering Division, University of Ryukyus. Mathematics & natural sciences}, month = {Mar}, note = {紀要論文}, pages = {17--22}, title = {The Born-Greeb Yvon 2 Theory at High Density Regions of Hard-Core Systems}, year = {1976} }