00309nam a2200133Ia 45000030006000000080041000060400015000471000014000622450037000762500011001132600022001245460012001460050017001580STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aLiu, C.L.  aElements of discrete mathematics  aSecond  bMcgraw hillc1985  aEnglish20220125165922.0