On the limit of non-standard q-Racah polynomials
  The aim of this article is to study the limit transitions from non-standard q-Racah polynomials to big q-Jacobi, dual q-Hahn, and q-Hahn polynomials such that the orthogonality properties and the three-term recurrence relations remain valid. 
R. Alvarez-Nodarse, R. Sevinik-Adiguzel
math.CA