1. Fonctions préharmoniques et fonctions préholomorphes;Ferrand;Bull. Sci. Math.,1944
2. Basic properties of discrete analytic functions;Duffin;Duke Math. J.,1956
3. A convolution product for discrete analytic function theory;Duffin;Duke Math. J.,1964
4. Operational Calculus;Mikusinski,1959
5. Operational calculus on the discrete analytic functions;Hayabara;Math. Japon.,1966