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• Title: Noncommutative geometry approach to principal and associated bundles [pdf]
  Authors: P.Baum (homepage), P.M.Hajac, R.Matthes, W.Szymanski
  

• Title: The K-theory of Heegaard-type quantum 3-spheres [pdf]
  Authors: P.Baum (homepage), P.M.Hajac, R.Matthes, W.Szymanski
  In: K-Theory
  math/0409573 [abs, src, pdf, other]

• Title: Hopf-cyclic homology and cohomology with coefficients [pdf]
  Authors: P.M.Hajac M.Khalkhali B.Rangipour Y.Sommerhaeuser
  In: Comptes Rendus Math. (Acad. Sci. Paris Ser. I)
  math/0306288



• Title: Stable anti-Yetter-Drinfeld modules [pdf]
  Authors: P.M.Hajac M.Khalkhali B.Rangipour Y.Sommerhaeuser
  In: Comptes Rendus Math. (Acad. Sci. Paris Ser. I) vol.338 (2004) 587-590.
  math/0405005



• Title: The Chern-Galois character [pdf]
  Authors: T.Brzezinski (homepage), P.M.Hajac
  In: Comptes Rendus Math. (Acad. Sci. Paris Ser. I) vol.338 (2004) 113-116.
  math/0306436



• Title: Graph C*-algebras and Z/2Z-quotients of quantum spheres
  Authors: P.M.Hajac R.Matthes W.Szymanski
  In: Reports on Mathematical Physics vol.51 (2003) 215-224.
  math/0209268 [abs, src, ps, other]



• Title: Chern numbers for two families of noncommutative Hopf fibrations [pdf]
  Authors: P.M.Hajac R.Matthes W.Szymanski
  In: Comptes Rendus Math. (Acad. Sci. Paris Ser. I) vol.336 (2003) 925--930.
  math/0302256 [abs, src, ps, other]



• Title: Quantum real projective space, disc and spheres [pdf]
  Authors: P.M.Hajac R.Matthes W.Szymanski
  In: Algebras and Representation Theory vol.6 169-192 May 2003
  math/0009185 [abs, src, ps, other]



• Title: Strong connections and Chern-Connes pairing in the Hopf-Galois theory [pdf]
  Authors: L.Dabrowski (homepage), H.Grosse (homepage), P.M.Hajac
  In: Communications in Mathematical Physics, 2001, vol.220, 301-331
  math/9912239 [abs, (the original publication is available on LINK), src, ps, other]



• Title: Bundles over quantum sphere and noncommutative index theorem [pdf]
  Author: Piotr M. Hajac
  In: K-Theory, 2000, vol.21, 141-150
  math/9809086 [abs, src, ps, other]



• Title: Projective module description of the q-Monopole [pdf]
  Authors: P.M.Hajac, S.Majid (homepage)
  In: Communications in Mathematical Physics, 1999, vol. 206, 247-264.
  math/9803003 [abs, src, ps, other]



• Title: Explicit Hopf-Galois description of $SL_{e^{2i\pi/3}}$-induced Frobenius homomorphisms
  Authors: L.Dabrowski (homepage), P.M.Hajac, P.Siniscalco
  In: Enlarged Proceedings of the ISI GUCCIA Workshop on quantum groups, non commutative geometry and fundamental physical interactions, D.Kastler, M.Rosso, T.Schucker (eds.), Commack - New York, Nova Science Pub, Inc., 1999, 279-298.
  q-alg/9708031 [abs, src, ps, other]



• Title: Coalgebra extensions and algebra coextensions of Galois type
  Authors: T.Brzezinski (homepage), P.M.Hajac
  In: Communications in Algebra, 1999, vol.27, 1347-1367.
  q-alg/9708010 [abs, src, ps, other]



• Title: Frame, cotangent and tangent bundles of the quantum plane
  Authors: P.M.Hajac, R.Matthes
  In: Proceedings of the workshop ``Lie Theory and its Applications in Physics II," Clausthal, August 1997. H.-D. Doebner, J. Hilgert, V. K. Dobrev (eds.) World Scientific Publ., 1998, 377-385.
  math/9803127 [abs, src, ps, other]



• Title: Quantum double-torus
  Authors: P.M.Hajac, T.Masuda
  In: Comptes Rendus Acad. Sci. Paris, Ser. I, Math., 1998, vol.327 (6) 553-558.
  math/9803092 [abs, src, ps, other]



• Title: A note on first order differential calculus on quantum principal bundles
  Author: Piotr M. Hajac
  In: Czechoslovak Journal of Physics, 1997, vol.47, 1139-1144
  (Proceedings of the 6th Colloquium on Quantum Groups and Integrable Systems.)
  q-alg/9708014 [abs, src, ps, other]



• Title: Strong connections on quantum principal bundles
  Author: Piotr M. Hajac
  In: Communications in Mathematical Physics, 1996, vol.182, 579-617
  hep-th/9406129 [abs, src, ps, other]



• Title: Metrics and pairs of left and right connections on bimodules
  Authors: L.Dabrowski (homepage), P.M.Hajac, G.Landi (homepage), P.Siniscalco
  In: Journal of Mathematical Physics, 1996, vol.37, 4635-4646
  q-alg/9602035 [abs, src, ps, other]



• Title: The Einstein action for algebras of matrix valued functions - toy models
  Author: Piotr M. Hajac
  In: Journal of Mathematical Physics, 1996, vol.37, 4549-4556
  q-alg/9510007 [abs, src, ps, other]



• Title: Axiomatic holonomy maps and generalized Yang-Mills moduli space
  Author: Piotr M. Hajac
  In: Letters in Mathematical Physics, 1993, vol.27, 301-309
  math-ph/9809019 [abs, src, ps, other]

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