00286nam a2200133Ia 45000030006000000080041000060400015000471000017000622450024000792500011001032600009001145460012001230050017001350STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aVatssa, B.S.  aDisrete mathematics  aSecond  c1988  aEnglish20220125165928.0