00335nam a2200133Ia 4500008004100000100001800041245005500059260000900114300001300123504000800136650001800144700001500162773002400177181130s2017    xx            000 0 und d  aDing, Xiaoqin  aA dual-level theory of the creation of labor value  c2017  ap.54-72.  dJan  aLabour values  aLu, Pinyue  aScience and Society