@article{10_4064_cm127_2_8,
     author = {Piotr Dowbor and Adam Hajduk},
     title = {Two classes of {almost
Galois} coverings for algebras},
     journal = {Colloquium Mathematicum},
     pages = {253--298},
     publisher = {mathdoc},
     volume = {127},
     number = {2},
     year = {2012},
     doi = {10.4064/cm127-2-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm127-2-8/}
}