Paul Shafer. 0 classes. Annals of Pure and Applied Logic, 163(3):321-337, 2012. [doi]
@article{Shafer12,
title = {0 classes},
author = {Paul Shafer},
year = {2012},
doi = {10.1016/j.apal.2011.10.002},
url = {http://dx.doi.org/10.1016/j.apal.2011.10.002},
researchr = {https://researchr.org/publication/Shafer12},
cites = {0},
citedby = {0},
journal = {Annals of Pure and Applied Logic},
volume = {163},
number = {3},
pages = {321-337},
}