Principle of boundary sources in the albedo problem for a semiinfinite medium

@article{Rumyantsev1969PrincipleOB,
  title={Principle of boundary sources in the albedo problem for a semiinfinite medium},
  author={G. Ya. Rumyantsev},
  journal={Soviet Atomic Energy},
  year={1969},
  volume={26},
  pages={510}
}