@article{1255989315,
author = {Eck, David J.},
title = {Natural sheaves},
journal = {Illinois J. Math.},
volume = {31},
number = {2},
year = {1987},
pages = { 200-207},
language = {en},
url = {http://dml.mathdoc.fr/item/1255989315}
}
Eck, David J. Natural sheaves. Illinois J. Math., Tome 31 (1987) no. 2, pp. 200-207. http://gdmltest.u-ga.fr/item/1255989315/