%0 Journal Article %A Bartosz ZieliƄski %T Piecewise Principal Coactions of Co-Commutative Hopf Algebras %J Symmetry, integrability and geometry: methods and applications %D 2014 %V 10 %U http://geodesic.mathdoc.fr/item/SIGMA_2014_10_a87/ %G en %F SIGMA_2014_10_a87