00315nam a2200097Ia 4500080001900000245006300019260007200082300001000154500003400164583001900198  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