@article{LeSh:539,
author = {Lifsches, Shmuel and Shelah, Saharon},
fromwhere = {IL, IL},
journal = {Journal of Symbolic Logic},
note = { arxiv:math/9404227 },
pages = {1206-1227},
title = {{Uniformization, choice functions and well orders in the class
 of trees}},
volume = {61},
year = {1996},
}