BibTex format
@article{LEO:1991:10.1103/PhysRevB.43.5166,
author = {LEO, J and MACKINNON, A},
doi = {10.1103/PhysRevB.43.5166},
journal = {PHYSICAL REVIEW B},
pages = {5166--5168},
title = {EXISTENCE OF WANNIER-STARK LOCALIZATION - COMMENT},
url = {http://dx.doi.org/10.1103/PhysRevB.43.5166},
volume = {43},
year = {1991}
}