I'm trying to find the solution to the 2D stationary diffusion equation
$$-D\nabla^2P(\vec{\rho_2})=\delta(\vec{\rho_1}-\vec{\rho_2})$$
where $\vec{\rho}=(x,y)$ and $D$ is the diffusion coefficient.
Help would be very much appreciated. Also, I'd be happy to get some references as well.
Thanks in advance.