00319nam a2200121Ia 4500082002000000100002300020245005700043260003500100300001400135490003800149500000500187700000500192  a530.1bSe454.MC  aSegal, Irving Ezra  aMathematical cosmology and extragalactic astronomyb  aNew YorkbAcademic Pressc1976  aix, 204p.  aPure and Applied Mathematicsv 68  a  a