00302nam a2200121Ia 4500082002000000100001900020245004400039260003400083300001400117490003900131500000500170700000500175  a515.42bW235.ET  aWalters, Peter  aErgodic theory; introductory lecturesb  aBerlinbSpringer-Verlagc1975  avi, 198p.  aLecture notes in Mathematicsv 458  a  a