Weak bimonads (Joint with Lack, Stephen; Street, Ross.)
J. Algebra, in press.
A categorical approach to cyclic duality. (Joint with Stefan, Dragos)
J. Noncommutative Geometry, in press.
The 2-category of weak entwining structures.
The weak theory of monads.
Adv. in Math. 225 (2010), 1-32.
Pre-torsors and Galois comodules over mixed distributive laws. (Joint with Menini, C.)
Appl. Cat. Str. in press. doi:10.1007/s10485-008-9185
Hopf Algebroids.
Handbook of Algebra Vol 6, edited by M. Hazewinkel, Elsevier, 2009, pp. 173-236.
Monads and comonads in module categories. (Joint with Brzezinski, T.; Wisbauer, R.)
J. Algebra 322 (2009) 1719-1747.
Examples of para-cocyclic objects induced by BD-laws. (Joint with Stefan, D.)
Algebr. Represent. Theory 12 (2009), no. 2-5, 153-180.
Morita theory of comodules. (Joint with Vercruysse, Joost.)
Comm. Algebra 37 (2009), no. 9, 3207-3247.
(Co)cyclic (co)homology of bialgebroids: an approach via (co)monads. (Joint with Stefan, D.)
Galois extensions over commutative and non-commutative base.
[in:] New techniques in Hopf algebras and graded ring theory, pp. 9-34,
S. Caenepeel and F. Van Oystaeyen (eds.)
K. Vlaam. Acad. Belgie Wet. Kunsten (KVAB), Brussels, 2007.
A Schneider type theorem for Hopf algebroids. (Joint with Ardizzoni, A.; Menini, C.)
J. Algebra 318 (2007), no. 1, 225-269.
Morita theory for coring extensions and cleft bicomodules. (Joint with Vercruysse, J.)
Adv. Math. 209 (2007), no. 2, 611-648.
Corrigendum. Adv. Math. 221 (2009), no 2, 682-686.
Pre-torsors and equivalences. (Joint with Brzezinski, Tomasz.)
J. Algebra 317 (2007), 544-580.
Corrigendum. J. Algebra 319 (2008), 1339-1340.
Cleft extensions of Hopf algebroids. (Joint with Brzezinski, Tomasz.)
Appl. Categ. Structures 14 (2006), no. 5-6, 431-469.
Corrigendum. Appl. Categ. Structures 17 (2009), no. 6, 613-620.
Strong connections and the relative Chern-Galois character for corings. (Joint with Brzezinski, T.)
Int. Math. Res. Not. 2005, no. 42, 2579-2625.
Galois theory for Hopf algebroids.
Ann. Univ. Ferrara Sez. VII (N.S.) 51 (2005), 233-262.
Integral theory for Hopf algebroids.
Algebr. Represent. Theory 8 (2005), no. 4, 563-599.
Corrigendum.Algebr. Represent. Theory in press. DOI 10.1007/s10468-009-9167-0
Internal bialgebroids, entwining structures and corings.
[in:] Algebraic structures and their representations, pp. 207-226,
J.A. de la Peña, E. Vallejo, N. M. Atakishiyev (eds.)
Contemp. Math., 376, Amer. Math. Soc., Providence, RI, 2005.
Hopf algebroid symmetry of abstract Frobenius extensions of depth 2. (Joint with Szlachanyi, K.)
Comm. Algebra 32 (2004), no. 11, 4433-4464.
On perturbative quantum field theory with boundary. (Joint with Bajnok, Z.; Takacs, G.)
Nuclear Phys. B 682 (2004), no. 3, 585-617.
Hopf algebroids with bijective antipodes: axioms, integrals, and duals. (Joint with Szlachanyi, K.)
J. Algebra 274 (2004), no. 2, 708-750.
An alternative notion of Hopf algebroid.
[in:] Hopf algebras in noncommutative geometry and physics, pp. 31-53,
S. Caenepeel and F. Van Oystaeyen (eds.)
Lecture Notes in Pure and Appl. Math., 239, Dekker, New York, 2005.
Boundary reduction formula. (Joint with Bajnok, Z.; Takacs, G.)
J. Phys. A 35 (2002), no. 44, 9333-9342.
Doi-Hopf modules over weak Hopf algebras.
Comm. Algebra 28 (2000), no. 10, 4687-4698.
Weak Hopf algebras. II. Representation theory, dimensions, and the Markov trace.(Joint with Szlachanyi, K.)
J. Algebra 233 (2000), 156-212.
Weak C*-Hopf algebras and multiplicative isometries. (Joint with Szlachanyi, K.)
J. Operator Theory 45 (2001), no. 2, 357-376.
Weak Hopf algebras. I. Integral theory and C*-structure. (Joint with Nill, F.; Szlachanyi, K.)
J. Algebra 221 (1999), no. 2, 385-438.
Weak C*-Hopf algebras: the coassociative symmetry of non-integral dimensions. (Joint with Szlachanyi, K.)
[in:] Quantum groups and quantum spaces (Warsaw, 1995), pp. 9-19,
R. Budzynski, W. Pusz and S. Zakrzewski (eds.)
Banach Center Publ., 40, Polish Acad. Sci., Warsaw, 1997.
A coassociative C*-quantum group with nonintegral dimensions. (Joint with Szlachanyi, K.)
Lett. Math. Phys. 38 (1996), no. 4, 437-456.