Marco Riccardi. Free Magmas. Formalized Mathematics, 18(1-4):17-26, 2010. [doi]
@article{Riccardi10,
title = {Free Magmas},
author = {Marco Riccardi},
year = {2010},
doi = {10.2478/v10037-010-0003-0},
url = {http://dx.doi.org/10.2478/v10037-010-0003-0},
researchr = {https://researchr.org/publication/Riccardi10},
cites = {0},
citedby = {0},
journal = {Formalized Mathematics},
volume = {18},
number = {1-4},
pages = {17-26},
}