1. M. S. Tswett, Proc. Warsaw Soc. Nat. Sci. Biol. Sect.XIV, minute No. 6 (1903). The English translation of this Russian publication is given in:G. Hesse andH. Weil, Michael Tswett's First Paper on Chromatography, M. Woelm, Eschwege, 1954.
2. M. Tswett, Ber. deutsch. bot. Ges.24, 313 (1906).
3. M. Tswett, Ber. deutsch. bot. Ges.24, 384 (1906).