1. Andreucci, E., 1962. Osservazioni sul marciume centrale dei fiori di Garafano. Riv. Ortoflorofruttic. ital. 46: 171–179.
2. Beijer, J. J., 1952. De ontwikkelingsstadia van de tulp. Laboratorium voor Bloembollenonderzoek, Lisse, Publ. No. 92, pp. 7.
3. Breakey, E. P. & Batchelor, G. S., 1950. Phyllody ofChrysanthemum and the eriophyid miteParaphytoptus chrysanthemi Keifer. Ann. ent. Soc. Am. 43: 492–494.
4. Burg, S. P., 1962. The physiology of ethylene formation. A. Rev. Pl. Physiol. 13: 265–302.
5. Burg, S. P., Apelbaum, A., Eisinger, W. & Kang, B. G., 1971. Physiology and mode of action of ethylene. Hort. Sci. 6: 359–364.