00275nam a2200109 a 450000500170000002000150001708200170003210000190004924500430006826000310011130000230014220251203110124.0  a8176351628  a005.758bGRE  aGreenwood, Ken  aSAMS Teach yourself ABAP /4 in 21 days  aNew DelhibTechmediac1999  axvii,730p.c23 cm.