Can't get examples from paper Solving Boundary Integral Problems with BEM++

Hello there!
For my bachelor’s, I was trying to find examples of simulating different antennas using bempp or bem++. I found that code examples presented in the following paper Solving Boundary Integral Problems with BEM++ https://dl.acm.org/doi/10.1145/2590830 can not be seen or downloaded anywhere on the web. I would like to get the “Exterior Dirichlet Problem” and “Scattering by a Screen” examples as presented in this paper.
Any help is greatly appreciated!
Best, Anthony.