Epstein Richard L <br/><br/>
Degrees of unsolvability: Structure and theory 
Epstein Richard L 
 - Berlin  Springer-Verlag           1979 
 - xii, 240p.  cm. 
 - Lecture notes in mathematics; 759 .
<br/><br/><label>Standard No.: </label>28757 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Higher algebra
<br/><br/><label>Dewey Class. No.: </label>B25, L93