TY - JOUR TI - An Informal Arithmetical Approach to Computability and Computation, III JO - Canadian mathematical bulletin PY - 1966 SP - 593 EP - 609 VL - 9 IS - 5 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1966-073-6/ DO - 10.4153/CMB-1966-073-6 ID - 10_4153_CMB_1966_073_6 ER -