@article{10_4064_ap_26_3_221_237,
     author = {Marvin Barsky},
     title = {Repeated convergence and fractional differences},
     journal = {Annales Polonici Mathematici},
     pages = {221--237},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1972},
     doi = {10.4064/ap-26-3-221-237},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-26-3-221-237/}
}