**************************** Theory Level ****************************
Input: [TheoryLevel = kohn_sham]

Exchange-correlation:
  Exchange
    Exchange in 1D for an soft-Coulomb interaction (LDA)
    [1] N. Helbig, J. I. Fuks, M. Casula, M. J. Verstraete, M. A. L. Marques, I. V. Tokatly, and A. Rubio.,  Phys. Rev. A 83, 032503 (2011)
  Correlation
    Casula, Sorella & Senatore (LDA)
    [1] M. Casula, S. Sorella, and G. Senatore.,  Phys. Rev. B 74, 245427 (2006)

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