00486nam a2200169Ia 4500082002100000100001800021245007200039260003100111300001500142500000500157690000600162700000500168952010200173964001700275921000900292999001500301  a330.183bP119.ME  aPacker, A. H.  aModels of economic systems ba theory for their development and use  aCambridgebMIT Pressc1972  axiv, 236p.  a  a   a  00104070aISIbISId1998-06-18l0o330.183 P119.MEpDP6864r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a2985  c2985d2985