00398nam a2200133Ia 450000500170000008000190001724500630003626000720009930000100017150000340018158300190021594200130023499900170024720260716043054.0  a08.15.02 I59to  aToken ring access method and physical layer specifications  bInstitute of Electrical and Electronics EngineersaNew YorkUSc1988  a89 p.  aAn American national standard  c3/7/00kM2LMGR  cMmI59to  c39773d39773