@article{SIGMA_2014_10_a30,
     author = {Piotr M. Hajac and Bartosz Zieli\'nski},
     title = {Nontrivial {Deformation} of {a~Trivial} {Bundle}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2014},
     volume = {10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2014_10_a30/}
}