LDR 00397nam a2200121zu 4500 008 090205n chi d 100 1 _aLiu Guoguang 245 _aSome Questions Concerning Marx's Theory of Productive Labor _cLiu Guoguang 773 0 _tSocial Sciences in China _gVol. 3.2 (1982); p. 27-54" 946 _a 001 IFS32730 999 _c304352 _d304352 952 _70 _c1 _40 _00 _9169018 _yBOOK _10 _d2009-05-14 _aIFS