Representative res estimate for no-PDF (yellow) study; author preference unknowable. Value -0.59 confirmed against Dahl DEDD ref Gol75 (El-r SR -0.59); Dahl cross-check CONFIRMED.
Gollnick, H. G. L. (1975): "Dynamic Structure of Household Expenditures in the Federal Republic of Germany: Analysis and Projections 1955-1969/1971 and 1975/1977." North-Holland Pub. Co.: Amsterdam