Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) T. Chan and A. E. Kyprianou and M. Savov,Smoothness of scale functions for spectrally negative Lévy processes,Probability Theory and Related Fields,0178-8051,Springer Science and Business Media LLC,2010-04-14,150,3-4,691-708,https://cir.nii.ac.jp/crid/1363388844780500352,https://doi.org/10.1007/s00440-010-0289-4