Gene Abrams, Efren Ruiz, and Mark Tomforde, Morita equivalence for graded rings, Journal of Algebra 617 (2023), pp. 79–112.
Sara E. Arklint, Søren Eilers, and Efren Ruiz, Geometric classification of isomorphism of unital graph \(C^*\)-algebras, New York J. Math. 28 (2022) pp. 927–957.
Søren Eilers, Efren Ruiz, and Aidan Sims, Amplified graph \(C^*\)-algebras II: Reconstruction, Proc. Amer. Math. Soc. Ser. B 9 (2022), pp. 297–310.
Søren Eilers, Gunnar Restorff, and Efren Ruiz, Strong classification of extensions of classifiable \(C^{*}\)-algebras, Bull. Korean Math. Soc. 59 (2022) no. 3, pp. 567-608
Toke Meier Carlsen, Efren Ruiz, Aidan Sims, and Mark Tomforde, Reconstruction of groupoids and \(C^*\)-rigidity of dynamical system, Adv. Math 390 (2021), 107923.
Søren Eilers, Gunnar Restorff, Efren Ruiz, and Adam P.W. Sørensen, The complete classification of unital graph \(C^*\)-algebras: Geometric and strong, Duke Math. J. 170(11): pp. 2421–2517 (15 August 2021).
Søren Eilers, James Gabe, Takeshi Katsura, Efren Ruiz, and Mark Tomforde, The extension problem for graph \(C^*\)-algebras, Annals of K-theory, Vol. 5 (2020), No. 2, pp. 295–315.
Sara E. Arklint, James Gabe, and Efren Ruiz, Hereditary \(C^*\)-subalgebras of graph \(C^*\)-algebras, J. Operator Theory 84 (1) (2020), pp. 99-126.
James Gabe and Efren Ruiz, The unital Ext-groups and classification of \(C^*\)-algebras, Glasgow Mathematical Journal , Volume 62 , Issue 1 , January 2020 , pp. 201 - 231.
Sara E. Arklint, Søren Eilers, and Efren Ruiz, A dynamical characterization of diagonal preserving \(*\)-isomorphisms of graph \(C^*\)-algebras, Ergodic Theory and Dynam. Systems, 38 (2018), no.7, pp. 2401–2421.
Søren Eilers, Gunnar Restorff, and Efren Ruiz, Automorphisms of Cuntz-Krieger algebras, J. Noncommut. Geom. 12 (2018), pp. 217–254.
Søren Eilers, Gunnar Restorff, Efren Ruiz, and Adam P.W. Sørensen, Geometric classification of graph \(C^*\)-algebras over finite graphs, Canad. J. Math. Vol. 70 (2), 2018 pp. 294–353.
Søren Eilers, Gunnar Restorff, Efren Ruiz, and Adam P.W. Sørensen, Invariance of the Cuntz splice, Math. Ann. (2017) 369, pp. 1061–1080.
Søren Eilers, Gunnar Restorff, and Efren Ruiz, Ideal related K-theory with coefficients, Houston J. Math. 43 (2) 2017, pp. 403–458.
Toke Meier Carlsen, Gunnar Restorff, and Efren Ruiz, Strong classification of purely infinite Cuntz-Krieger algebras, Trans. Amer. Math. Soc., Series B Volume 4, pp. 1–30 (March 17, 2017).
Toke Meier Carlsen, Efren Ruiz, and Aidan Sims, Equivalence and stable isomorphism of groupoids, and diagonal-preserving stable isomorphisms of graph \(C^*\)-algebras and Leavitt path algebras, Proc. Amer. Math. Soc., 145, no. 4, pp. 1581–1592.
James Gabe and Efren Ruiz, Classification of tight \(C^*\)-algebras over the one-point compactification of \(\mathbb{N}\), J. Operator Theory 76 (2016), no. 1, pp. 175–204.
Sren Eilers, Xin Li, and Efren Ruiz, The isomorphism problem for semigroup \(C^*\)-algebras of right-angled Artin monoids, Doc. Math. 21 (2016), pp. 309–343.
Sara E. Arklint, Gunnar Restorff, and Efren Ruiz, Classification of real rank zero, purely infinite \(C^*\)-algebras with at most four primitive ideals, J. Funct. Anal. 271 (2016), no. 7, pp. 1921–1947.
Jeffrey L. Boersema, Terry A. Loring, and Efren Ruiz, Pictures of KK-theory for real \(C^*\)-algebras and almost commuting matrices, Banach J. Math. Anal. 10 (2016), no. 1, pp. 27–47.
Søren Eilers, Gunnar Restorff, and Efren Ruiz, Corrigendum to “Classifying \(C^*\)-algebras with both finite and infinite subquotients’’ [J. Funct. Anal. 265 (2013) 449–468], J. Funct. Anal. 270 (2016), no. 2, pp. 854–859.
Sara E. Arklint and Efren Ruiz, Corners of Cuntz-Krieger algebras, Trans. Amer. Math. Soc. 367 (2015), no. 11, pp. 7595–7612.
Efren Ruiz, Aidan Sims, and Adam P.W. Sørensen, UCT-Kirchberg algebras have nuclear dimension one, Adv. Math. 279 (2015), pp. 1–28.
James Gabe, Efren Ruiz, Mark Tomforde, and Tristan Whalen, K-theory for Leavitt path algebras: computation and classification, J. Algebra 33 (2015), pp. 35–72.
Efren Ruiz, Aidan Sims, Mark Tomforde, The nuclear dimension of graph \(C^*\)-algebras, Adv. Math. 272 (2015), pp. 96–123.
Efren Ruiz and Mark Tomforde, Ideals in graph algebras, Algebr. Represent. Theory 17 (2014), no. 3, pp. 849–861.
Søren Eilers, Gunnar Restorff, and Efren Ruiz, The ordered K-theory of a full extension, Canad. J. Math. 66 (2014), no. 3, pp. 596–625.
Søren Eilers, Takeshi Katsura, Efren Ruiz, and Mark Tomforde, Identifying AF-algebras that are graph \(C^*\)-algebras, J. Funct. Anal. 266 (2014), pp. 3968–3996.
Efren Ruiz and Mark Tomforde, Ideal-related K-theory for Leavitt path algebras and graph \(C^*\)-algebras, Indiana Univ. Math. J. 62 (2013), no. 5, pp. 1587–1620.
Søren Eilers, Gunnar Restorff, and Efren Ruiz, Classifying \(C^*\)-algebras with both finite and infinite subquotients, J. Funct. Anal. 265 (2013), no. 3, pp. 449–468.
Ping Wong Ng and Efren Ruiz, The automorphism group of a simple \(\mathcal{Z}\)-stable \(C^*\)-algebra, Trans. Amer. Math. Soc., 365 (2013), pp. 4081–4120.
Efren Ruiz and Mark Tomforde, Classification of unital simple Leavitt path algebras of infinite graphs, J. Algebra, 384 (2013), pp. 45–83.
Søren Eilers, Efren Ruiz, and Adam Sørensen, *Amplified graph \(C^*\)-algebras, Munster J. of Math., 5 (2012), pp. 121–150.
Ping Wong Ng and Efren Ruiz, On the structure of the projective unitary group of the multiplier algebra of a simple stable \(C^*\)-algebra, J. Operator Theory 68 (2012), pp. 549–565.
Sara E. Arklint, Gunnar Restorff, and Efren Ruiz, Filtrated K-theory for real rank zero \(C^*\)-algebras, Internat. J. Math., 23 (2012), no. 8, 1250078, 19 pp.
Jeffrey L. Boersema, Efren Ruiz, and Peter J. Stacey, The classification of real purely infinite simple \(C^*\)-algebras, Documenta Math., 16 (2011), pp. 619–655.
Jeffrey L. Boersema and Efren Ruiz, Stability of real \(C^*\)-algebras, Canad. Math. Bull., 54, no. 4 (2011), pp. 593–606.
Søren Eilers, Gunnar Restorff, and Efren Ruiz, Nonsplitting in Kirchberg’s ideal-related KK-Theory, Canad. Math. Bull., 54 (2011), no. 1, pp. 68–81.
Ping Wong Ng and Efren Ruiz, Simplicity of the projective unitary group of the multiplier algebra of a simple stable nuclear \(C^*\)-algebra, Rocky Mountain J. Math. 40 (2010), no. 5, pp. 1649–1665.
Søren Eilers, Gunnar Restorff, and Efren Ruiz, On graph \(C^*\)-algebras with a linear ideal lattice, Bull. Malays. Math. Sci. Soc. 33(2) (2010), pp. 233–241.
Søren Eilers, Gunnar Restorff, and Efren Ruiz, Classification of extensions of classifiable \(C^*\)-algebras, Adv. Math. 222 (2009), no. 6, pp. 2153–2172.
Ping Wong Ng and Efren Ruiz, The structure of the unitary group of certain simple \(C^*\)-algebras, Houston J. Math 35 (4) 2009, pp. 1203–1232.
Ping Wong Ng, Zhuang Niu, and Efren Ruiz, Simple unital \(C^*\)-algebras with the stable local finite dimensional property, J. Operator Theory 61(1) 2009, pp. 147-169.
Ping Wong Ng and Efren Ruiz, The automorphism group of a simple tracially AI algebra, Comm. Math. Physics. 280 (2008) no. 2, pp. 427–444.
Ping Wong Ng and Efren Ruiz, Extending maps in K-theory, Int. J. Pure and Applied Math. 41 No. 3 2007, pp. 419–442.
Gunnar Restorff and Efren Ruiz, On Rordam’s classification of certain \(C^*\)-algebras with one non-trivial ideal, II, Math. Scand. 101 (2) 2007, pp. 280–292.
Efren Ruiz, Homomorphisms and strong approximate unitary equivalence, Indiana Univ. Math. J. 56 No. 3 (2007) pp. 1333–1360.
Efren Ruiz, A classification theorem for direct limits of extensions of circle algebras by purely infinite \(C^*\)-algebras, J. Operator theory 58 (2) 2007 pp. 311-349.
Søren Eilers, Gunnar Restorff, and Efren Ruiz, Classification of graph \(C^*\)-algebras with no more than four primitive ideals, Operator algebra and dynamics, pp. 89–129, Springer Proc. Math. Stat., 58, Springer, Heidelberg, 2013.
Søren Eilers, Gunnar Restorff, Efren Ruiz, and Adam P.W. Sørensen, Filtered K-theory for graph algebras, 2016 Matrix annals, pp. 229–249, MATRIX Book Ser. 1, Springer, Cham, 2018.