Limit relations between $q$-Krall type orthogonal polynomials
  In this paper, we consider a natural extension of several results related to Krall-type polynomials introducing a modification of a $q$-classical linear functional via the addition of one or two mass points. The limit relations between the $q$-Krall type modification of big $q$-Jacobi, little $q$-Jacobi, big $q$-Laguerre, and other families of the $q$-Hahn tableau are established. 
R. \'Alvarez-Nodarse and R. S. Costas-Santos
math.CA