@article{10_4064_ap111_2_1,
     author = {Barbara Opozda and Udo Simon},
     title = {Parallel hypersurfaces},
     journal = {Annales Polonici Mathematici},
     pages = {107--135},
     publisher = {mathdoc},
     volume = {111},
     number = {2},
     year = {2014},
     doi = {10.4064/ap111-2-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap111-2-1/}
}