@article{00918298,
title = {A counterexample to a conjecture of Barr.},
journal = {Theory and Applications of Categories [electronic only]},
volume = {2},
year = {1996},
pages = {36-39},
zbl = {0864.19003},
language = {en},
url = {http://dml.mathdoc.fr/item/00918298}
}
Whitehouse, Sarah. A counterexample to a conjecture of Barr.. Theory and Applications of Categories [electronic only], Tome 2 (1996) pp. 36-39. http://gdmltest.u-ga.fr/item/00918298/