00296nam a2200121Ia 4500082002000000100002600020245003100046260003500077300001000112490004200122500000500164700000500169  a511.3bSh559.DU  aShoenfield, Joseph R.  aDegrees of unsolvabilityb  aAmsterdambNorth-Hollandc1971  a111p.  aNorth-Holland Mathematics studiesv 2  a  a