1-4 of 4 Books

q-difference operators, orthogonal polynomials, and symmetric expansions
By Douglas Bowman
Differential operator equations
Differential operator equations
By A. A. Dezin
Studies on commuting difference systems arising from solvable lattice models
Studies on commuting difference systems arising from solvable lattice models
By Tetsuya Kikuchi

Analytic methods in the theory of differential and pseudo-differential equations of parabolic type
By Samuil D. Eidelman,Stepan D. Ivasyshen,Anatoly N. Kochubei