@article{BDFP86,
AUTHOR = {Borodin, A. and Dolev, D. and Fich, F. and Paul, W.J.},
TITLE = {Bounds for Width-Two Branching Programs},
VOLUME = {15},
YEAR = {1986},
PAGES = {549--560},
BOOKTITLE = {SIAM J. Comput. 1986},
EE = {http://doi.acm.org/10.1145/800061.808736},
}