@article{10_4064_fm22_10_2015,
     author = {Boyang Ding and Changming Ding},
     title = {Prolongational centers and their depths},
     journal = {Fundamenta Mathematicae},
     pages = {287--296},
     publisher = {mathdoc},
     volume = {234},
     number = {3},
     year = {2016},
     doi = {10.4064/fm22-10-2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm22-10-2015/}
}