TY  - BOOK
AU  - P. M Cohn
TI  - Free rings and their relations
U1  - 512.4 
PY  - 1971///
CY  - New York
PB  - Academic Press
N1  - P. M Cohn: Free rings and their relations.  New York.  Academic Press, 1971.--(512.4COH)
ER  -