00324nam a2200121Ia 4500008004100000041001200041082001700053100001500070245004700085260001600132300001100148650004300159231217s9999    xx            000 0 und d  aEnglish  a001.424  SHA  aSharma J K 0aMathematical models in operations research  c1989bT M H  axv+620  aMathematical models Operation research