TY  - BOOK
AU  - Fossum Robert M
AU  -  Griffith Phillip A
AU  -  Reiten Idun
TI  - Trivial extensions of a-belian categories
T2  - Lecture Notes in Mathematics; 456
U1  - B27, L54 
PY  - 1975///
CY  - New York    
PB  -  Springer-Verlag        
ER  -