Where Can I Find Information on Fourier Series in 2-D and Orthogonal Systems?

[DrKareem]

Hi. I've been trying to find some material about Fourier Series in 2-D, along with 2-D Orthogonal Systems, but i haven't been able to find any about the former in any of the books i have (Toslov and Butkov's Mathematical Physics) nor online (nothing on mathworld?). Any input would be appreciated.

 

[gammamcc]

This works for me:Partial Differential Equations and Boundary Value Problems With Applications
by Mark A. Pinsky

 

[DrKareem]

Thanks I'll check it out.