TY  - SER
TI  -  Journal of pure and applied algebra
SN  -  0022-404
U1  -  PER 512 J6 
PY  - 1973///-
CY  -  Netherlands : 
PB  -  North Holland publishing co., 
KW  -  Algebra
KW  -  Periodicals
N1  -  Vol. 69, No. 2 1990
ER  -