@article{DMGAA_2006_26_1_a3,
     author = {Benzaghou, Benali and Barsky, Daniel},
     title = {Extension of classical sequences to negative integers},
     journal = {Discussiones Mathematicae. General Algebra and Applications},
     pages = {75--83},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGAA_2006_26_1_a3/}
}