@article{AIF_2001__51_2_297_0,
     author = {Clarke, Francis and Hunton, John and Ray, Nigel},
     title = {Extensions of umbral calculus {II:} double delta operators, {Leibniz} extensions and {Hattori-Stong} theorems},
     journal = {Annales de l'Institut Fourier},
     pages = {297--336},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {51},
     number = {2},
     year = {2001},
     doi = {10.5802/aif.1824},
     mrnumber = {1824956},
     zbl = {0962.05012},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/aif.1824/}
}