허신행 허덕 이철현 2018-11-15T07:45:29Z 2018-11-15T07:45:29Z 1987-06 D044 http://repository.krei.re.kr/handle/2018.oak/13514 집유제도 개선방향 A Direction to Improve Milk Collection System KREI 보고서 Huh, Shinhaeng Huh, Duk Lee, Chulhyun