Some (2, n) combinatorial Stein groupoids.
Pelling, M.J. ; Rogers, D.G.
Aequationes mathematicae, Tome 20 (1980), p. 225-235 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1980-01-01
EUDML-ID : urn:eudml:doc:182432 
@article{GDZPPN002550423,
     title = {Some (2, n) combinatorial Stein groupoids.},
     journal = {Aequationes mathematicae},
     volume = {20},
     year = {1980},
     pages = {225-235},
     zbl = {0465.20064},
     url = {http://dml.mathdoc.fr/item/GDZPPN002550423}
}

Pelling, M.J.; Rogers, D.G. Some (2, n) combinatorial Stein groupoids.. Aequationes mathematicae, Tome 20 (1980) pp. 225-235. http://gdmltest.u-ga.fr/item/GDZPPN002550423/