Epstein, Richard L <br/><br/>
Degrees of unsolvability: Structure and theory 
Richard L Epstein 
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 - Springer-Verlag, Berlin  1979 
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 - Lecture Notes in Mathematics, No.0759 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lecture Notes in Mathematics
<br/><br/><label>Dewey Class. No.: </label>R  LNM.0759