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http://joone.net/2018/01/14/11-bsd-%ec%9c%a0%eb%8b%89%ec%8a%a4-4%ed%99%94-csrgcomputer-science-research-group-%ea%b2%b0%ec%84%b1/
14. BSD 유닉스 4화 - CSRG(Computer Systems Research Group) 결성