TY  - BOOK
AU  - Barr Michael
AU  -  Grillet Pierre A
AU  -  Vanosdal Donovan H
TI  - Exact categories and categories of sheaves
T2  - Lecture notes in mathematics; 236
U1  - B316, L18 
PY  - 1971///
CY  - Berlin
PB  - Springer Verlag      
KW  - Topology
ER  -