Holger Spakowski, Rahul Tripathi. Hierarchical Unambiguity. SIAM Journal on Computing, 38(5):2079-2112, 2009. [doi]
@article{SpakowskiT09,
title = {Hierarchical Unambiguity},
author = {Holger Spakowski and Rahul Tripathi},
year = {2009},
doi = {10.1137/07068196X},
url = {http://dx.doi.org/10.1137/07068196X},
researchr = {https://researchr.org/publication/SpakowskiT09},
cites = {0},
citedby = {0},
journal = {SIAM Journal on Computing},
volume = {38},
number = {5},
pages = {2079-2112},
}