The free A-ring is a graded A-ring.
Warren, Roger D.
International Journal of Mathematics and Mathematical Sciences, Tome 16 (1993), p. 617-619 / Harvested from The Electronic Library of Mathematics
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Publié le : 1993-01-01
DOI : https://doi.org/10.1155/S0161171293000766
EUDML-ID : urn:eudml:doc:46949 
@article{00436746,
     title = {The free },
     journal = {International Journal of Mathematics and Mathematical Sciences},
     volume = {16},
     year = {1993},
     pages = {617-619},
     doi = {10.1155/S0161171293000766},
     zbl = {0791.16021},
     language = {en},
     url = {http://dml.mathdoc.fr/item/00436746}
}

Warren, Roger D. The free . International Journal of Mathematics and Mathematical Sciences, Tome 16 (1993) pp. 617-619. doi : 10.1155/S0161171293000766. http://gdmltest.u-ga.fr/item/00436746/