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4. Keylwerth, R. 1962: Untersuchungen über freie und behinderte Quellung. Zweite Mitteilung: Behindere Quellung. Holz Roh-Werkstoff 20: 292–303
5. Kokociński, W.; Raczkowski, J. 1978: Einfluß der Reibung zwischen Prüfkörper und Druckplatten auf die Druckfestigkeit parallel zur Faser. Holz Roh-Werkstoff 36: 241–246