@techreport{FoupouagnigniKoepfRonveaux1998, author = {Mama Foupouagnigni and Wolfram Koepf and Andre Ronveaux}, title = {Fourth Order Difference Equation for the Associated Classical Discrete Orthogonal Polynomials}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {SC-97-72}, language = {eng}, year = {1998} }