References for Zn XX

.elvlc file (energy levels)

% Theoretical energy levels:  Sampson, D. H., Zhang, H. L., Fontes, C. J., 1990, ADNDT, 44, 209.
%energy levels:  Martin, W. C., Sugar, J., Musgrove, A., and Dalton, G. R., 1995,
NIST Database for Atomic Spectroscopy, Version 1.0, NIST Standard Reference Database 61.
%produced as part of the Arcetri/Cambridge/NRL atomic data base collaboration CHIANTI
  and the Arcetri Spectral Code
% Enrico Landi 1997

.splups file (collision data)

%collision strengths: Zhang, Sampson, Fontes, 1990, ADNDT, 44, 209
%produced as part of the Arcetri/Cambridge/NRL atomic data base collaboration CHIANTI
  and the Arcetri Spectral Code
% Enrico Landi 1997

.wgfa file (radiative data)

%energy levels:  Martin, W. C., Sugar, J., Musgrove, A., and Dalton, G. R., 1995,
NIST Database for Atomic Spectroscopy, Version 1.0, NIST Standard Reference Database 61.
%Allowed transitions oscillator strengths: Zhang, Sampson, Fontes, 1990, ADNDT, 44, 209
%produced as part of the Arcetri/Cambridge/NRL atomic data base collaboration CHIANTI
  and the Arcetri Spectral Code
%Enrico Landi - 1997