H. H. Felle; A. Herrmann; R. Hückelhoven; K.-H. Kogel (diciembre de 2005). «Root-to-shoot signalling: apoplastic alkalinization, a general stress response and defence factor in barley (Hordeum vulgare)». Protoplasma (Springer Wien) 227 (1): 17-24. PMID16389490. doi:10.1007/s00709-005-0131-5.
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H. H. Felle; A. Herrmann; R. Hückelhoven; K.-H. Kogel (diciembre de 2005). «Root-to-shoot signalling: apoplastic alkalinization, a general stress response and defence factor in barley (Hordeum vulgare)». Protoplasma (Springer Wien) 227 (1): 17-24. PMID16389490. doi:10.1007/s00709-005-0131-5.