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(1851–1920) Frederic Hymen Cowen (1852–1935) Oskar Eichberg (de) (1845–1898) Otto Fiebach (de) (1851–1937) Ernst Flügel (de) (1844–1912) Theophil Forchhammer (de)
Aktiengesellschaft, Frankfurt am Main, 1982, (OCLC 312302809). Klemens Fiebach, Resins, Natural, 1–2, dans Ullmann's Encyclopedia of Industrial Chemistry