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  1. NLM Digital Collections - Index-catalogue of the Library of the Surgeon General's Office, United States Army (Series 4, ... 
    Publication: Washington : U.S. G.P.O., 1936-1948
    resource.nlm.nih.gov/8104688X10
    ... pigmento bruno delle brattee di Asphodelus albus e Centaurea. Riv. biol., 1934, 17: 1-8. Schaaf, K. ...
  2. NLM Digital Collections - Index-catalogue of the Library of the Surgeon General's Office, United States Army (Series 4, ... 
    Publication: Washington : U.S. G.P.O., 1936-1948
    resource.nlm.nih.gov/8104688X1
    ... pigments anthocyaniques particuliers de Gentiana verna et de Centaurea cyanus. Ibid, 1926, 95: 1548-52.—Lippmaa, T. ...