fundamental solution of radial wave equation

i am trying to find resources on the derivation of the fundamental solution to the radial wave equation. any suggestions of or links to books, papers, and/or notes would be much appreciated. i have tried searching google, arxiv, etc. for information, but i haven't come up with anything useful yet. there's a lot of material pertaining to physics concerning using the solution, but i need the derivation.

i've been learning about solutions to the wave equation for euclidean dimensions 1-3 (d'Alembert's formula, spherical means, method of descent), and the above is my next task. if you have any general insight about the radial wave equation, this would be helpful as well. thanks!

(background: 3rd year graduate student in mathematics)

edit: if no one has any specific references to the derivation, then what about context? does the spherically symmetric wave equation mean the same thing as the radial wave equation? i know that seems like a possibly ignorant question, but to someone unfamiliar with or new to this, i think it's good to be cautious and not say well they sound the same.

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Do you really need 'resources' on it, or would someone here giving you the derivation work too? – Ricky Demer Oct 7 '10 at 20:26
someone giving the derivation here would work. this isn't for a course or anything, but i just need to learn it and work through it myself. i am just really not for sure of the idea/approach needed or motivation, other than i guess the equation governs waves whose amplitude only depends on the radial distance from the origin. i don't know if there are different methods depending on the dimension, but the 3-dimensional case or as general solution as possible would be best. thank you for the response. – nikofeyn Oct 7 '10 at 20:33
In you already know about spherical means, then don't you already have a derivation in front of you? (E.g. the first 5 pages of Chris Sogge's Lecture on Nonlinear Wave Equations.) – Willie Wong Oct 7 '10 at 21:59
... or S.Selberg's lecture notes math.ntnu.no/~sselberg/HopkinsLectures.pdf – Willie Wong Oct 7 '10 at 22:03
As far as I know, "radial wave equation" means the same thing as "spherically symmetric wave equation". – Deane Yang Oct 8 '10 at 2:14