Jonathon Funk, Benjamin Steinberg. The Universal Covering of an Inverse Semigroup. Applied Categorical Structures, 18(2):135-163, 2010. [doi]
@article{FunkS10,
title = {The Universal Covering of an Inverse Semigroup},
author = {Jonathon Funk and Benjamin Steinberg},
year = {2010},
doi = {10.1007/s10485-008-9147-2},
url = {http://dx.doi.org/10.1007/s10485-008-9147-2},
researchr = {https://researchr.org/publication/FunkS10},
cites = {0},
citedby = {0},
journal = {Applied Categorical Structures},
volume = {18},
number = {2},
pages = {135-163},
}