@article{1256047051,
author = {Mielke, M. V.},
title = {Exact intervals},
journal = {Illinois J. Math.},
volume = {25},
number = {4},
year = {1981},
pages = { 593-597},
language = {en},
url = {http://dml.mathdoc.fr/item/1256047051}
}
Mielke, M. V. Exact intervals. Illinois J. Math., Tome 25 (1981) no. 4, pp. 593-597. http://gdmltest.u-ga.fr/item/1256047051/