@article{10_4064_sm173_3_2,
     author = {Zenon J. Jab{\l}o\'nski and Il Bong Jung and Jan Stochel},
     title = {Backward extensions of hyperexpansive operators},
     journal = {Studia Mathematica},
     pages = {233--257},
     year = {2006},
     volume = {173},
     number = {3},
     doi = {10.4064/sm173-3-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm173-3-2/}
}