@phdthesis{oai:tsukuba.repo.nii.ac.jp:00008235,
 author = {Kawakami, Toshikazu and 川上, 敏和},
 month = {},
 note = {1. Introduction 1.1 An overview of the study of collusion In many industries the market structures are characterizes by oligopoly. In oligopolistic markets, a few firms are likely to interact with their rivals repeatedly for a long time. ..., 1999, Includes bibliographical references (p. 96-102)},
 school = {筑波大学, University of Tsukuba},
 title = {Four studies on co-operative firm behaviors in industrial organization},
 year = {1999}
}