help for a mathematica question

Hi,

I am trying to solve the following partial differential equation with 4 boundary conditions with mathematica. But it doesn't work.

\sigma is a constant in here.
Simplify[DSolve[
t[y, z] - \[Gamma]^2*(D[t[y, z], {y, 2}] +
D[t[y, z], {z, 2}]) == \[Sigma], t, {y, z}]]

The boundary conditions are:
t(y,0)=\sigma
t(y,L)=\sigma
t(-h/2,Z)=0
t(h/2,Z)=0

Does anyone cknow how to solve the problem?
If matlab is better to solve these kind of questions, how can I solve this question with Matlab?

Thanks for advance
atepe
.

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