00341nam a2200133Ia 4500008004100000040001700041041001200058082001700070100001900087245003000106250001200136260004800148300001100196230917s9999||||xx |||||||||||||| ||und||  e155085aMAIN  aEnglish  a512.22 H888N  aHumphreys, J F 0aNumbers, groups and codes  a2nd ed.  aCambridgebCambridge University Pressc2004  a338 p.