@book{ BA01095709,
 author = "Utton, M. A. (Michael A.)",
 title = "Diversification and competition",
 publisher = "Cambridge University Press",
 year = "1979",
 series = "Occasional papers / National Institute of Economic and Social Research",
 number = "31",
 URL = "https://ci.nii.ac.jp/ncid/BA01095709"
}
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