Holger Spakowski, Rahul Tripathi. LWPP and WPP are not uniformly gap-definable. J. Comput. Syst. Sci., 72(4):660-689, 2006. [doi]
@article{SpakowskiT06:0,
title = {LWPP and WPP are not uniformly gap-definable},
author = {Holger Spakowski and Rahul Tripathi},
year = {2006},
doi = {10.1016/j.jcss.2006.01.002},
url = {http://dx.doi.org/10.1016/j.jcss.2006.01.002},
researchr = {https://researchr.org/publication/SpakowskiT06%3A0},
cites = {0},
citedby = {0},
journal = {J. Comput. Syst. Sci.},
volume = {72},
number = {4},
pages = {660-689},
}