00318nam a2200121Ia 45000030006000000080041000060400015000471000024000622450044000862600037001305460012001670050017001790STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aRonald Shephard, W.  aTheory of cost and production functions  bPrinceton university pressc1970  aEnglish20220125165609.0