Roussos, P.A., Dimitriou, G. and Voloudakis, A.E. 2011. Short communication. N-(2-chloro-4-pyridyl)-N-phenylurea(4-CPPU) enhances in vitro direct shoot organogenesis of Citrus aurantium L. epicotyl segments compared to other commonly used cytokinins. Spanish Journal of Agricultural Research. 9, 2 (May 2011), 504-509. DOI:https://doi.org/10.5424/sjar/20110902-201-10.