00290nam a2200097Ia 4500008004100000082001600041100004100057245004800098260003800146300000800184140113s9999    xx            000 0 und d  a311:63   L1  a"Dent,J.B. and Anderson, J.R., Eds."  aSystems analysis in agricultural management  a1971bJohn Wiley & SonscNew York  a394