00305nam a2200121Ia 45000030006000000080041000060400015000471000018000622450065000802600009001455460012001540050017001660STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aSitaram Singh  aTechnological parameters in agricultural production function  c1986  aEnglish20220125165556.0