BibTex format
@article{PRETZEL:1986:10.1007/BF00390104,
author = {PRETZEL, O},
doi = {10.1007/BF00390104},
journal = {ORDER-A JOURNAL ON THE THEORY OF ORDERED SETS AND ITS APPLICATIONS},
pages = {135--153},
title = {ON REORIENTING GRAPHS BY PUSHING DOWN MAXIMAL VERTICES},
url = {http://dx.doi.org/10.1007/BF00390104},
volume = {3},
year = {1986}
}