A congruence property of irreducible Laguerre polynomials in two   variables
  In this paper we introduce a version of irreducible Laguerre polynomials in two variables and prove for it a congruence property, which is similar to the one obtained by Carlitz for the classical Laguerre polynomials in one variable. 
Nikolai A. Krylov and Zhangyuan Li
math.CA