00325nam a2200121Ia 4500082002000000100002000020245005200040260003600092300002200128490004300150500000500193700000500198  a519.233bK27.MC  aKeilson, Julian  aMarkov chain models-rarity and exponentialityb  aNew YorkbSpringer-Verlagc1979  axiii, 184p. Index  aApplied Mathematical Sciences v v. 28  a  a