@misc{Kupka,
  author    = {Kupka, Friedrich},
  title     = {Improvements to the Short-Characteristics Method in 3D RHD Simulations and some Unsolved Problems in Spectral Line Shapes of A-type Stars},
  subject      = {Convection},
  language  = {en}
}
@misc{Kupka,
  author    = {Kupka, Friedrich},
  title     = {Improvements in Numerical and Analytical Modelling Techniques to Study the Solar Surface},
  subject      = {Convection},
  language  = {en}
}