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Haaß, D. and Abou-Mandour, A. A. and Blaschek, W. and Franz, Gerhard (1991) The influence of phytohormones on growth, organ differentiation and fructan production in callus of Symphytum officinale L. Plant Cell Reports 10, pp. 421-424.
Abou-Mandour, A. A. and Czygan, F.-C. and Haaß, D. and Franz, Gerhard (1987) Fructan Synthesis in Tissue Cultures of Symphytum officinale. Planta Medica 53, pp. 482-487.
Franz, Gerhard and Czygan, F.-C. and Abou-Mandour, A. A. (1982) Pharmazeutisch biologische Untersuchungen der Gattung Harpagophytum (Bruch.) DC ex Meissn. Planta Medica 44, pp. 218-220.