Variational Calculations for $^3$He Impurities on $^4$He Droplets
  Variational Monte Carlo method is used to calculate ground state properties of $^4$He droplets, containing 70, 112, 168, 240, 330, and 728 particles. The resulting particle and kinetic energy densities are used as an input in the Feynman-Lekner theory for $^3$He impurities. The kinetic energy density of $^4$He atoms and the energy of the $^3$He surface states are compared with the results of previous phenomenological calculations. 
A. Beli\'c, F. Dalfovo, S. Fantoni, and S. Stringari