Geodesic
A Direct Approach to Co-Universal Algebras Associated to Directed Graphs
Bulletin of the Malaysian Mathematical Society, Tome 33 (2010) no. 2 Cet article a éte moissonné depuis la source Bulletin of the Malaysian Mathematical Society website

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We prove directly that if E is a directed graph in which every cycle has an entrance, then there exists a C *-algebra which is co-universal for Toeplitz-Cuntz-Krieger E -families. In particular, our proof does not invoke ideal-structure theory for graph algebras, nor does it involve use of the gauge action or its fixed point algebra.
Classification : Primary: 46L05. 
@article{BMMS_2010_33_2_a4,
     author = {Aidan Sims and Samuel B. G. Webster},
     title = {A {Direct} {Approach} to {Co-Universal} {Algebras} {Associated} to {Directed} {Graphs}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2010},
     volume = {33},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2010_33_2_a4/}
}
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Aidan Sims; Samuel B. G. Webster. A Direct Approach to Co-Universal Algebras Associated to Directed Graphs. Bulletin of the Malaysian Mathematical Society, Tome 33 (2010) no. 2. http://geodesic.mathdoc.fr/item/BMMS_2010_33_2_a4/