00340nam a2200121 a 450000500170000002000150001708200210003210000200005324500560007326000340012930000190016349000360018220251203091515.0  a3540516476  a539.721,bD, nac  aNachtmann, Otto  aElementary particle physics: concepts and phenomena  aBerlinbSpringer-Verlagc1990  axix,559p, 24cm  aTexts and monographs in physics