William W. Boone. Partial results regarding word problems and recursively enumerable degrees of unsolvability. Bulletin of the American Mathematical Society, vol. 68 (1962), pp. 616–623.

1963 ◽  
Vol 28 (4) ◽  
pp. 292-292
Author(s):  
Marian Boykan Pour-El

1968 ◽  
Vol 33 (2) ◽  
pp. 296-297
Author(s):  
J. C. Shepherdson


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