Sylvain Salvati. 2 is captured by the IO and the OI hierarchies. J. Comput. Syst. Sci., 81(7):1252-1277, 2015. [doi]
@article{Salvati15,
title = {2 is captured by the IO and the OI hierarchies},
author = {Sylvain Salvati},
year = {2015},
doi = {10.1016/j.jcss.2015.03.004},
url = {http://dx.doi.org/10.1016/j.jcss.2015.03.004},
researchr = {https://researchr.org/publication/Salvati15},
cites = {0},
citedby = {0},
journal = {J. Comput. Syst. Sci.},
volume = {81},
number = {7},
pages = {1252-1277},
}