00268nam a2200121Ia 4500082001700000100001600017245003600033300001600069490001600085490002700101490001300128500000500141  a338.9 B627b  aBlack, John  aTheory of indicative planningb  app. 303-319  vv.20, no.3   aOxford economic papers  aNov.1968  a