Ragozzino, E., Faggioli, F. and Barba, M. (2005) “Distribution of Citrus Exocortis Viroid and Hop Stunt Viroid in Cirtus Orchards of Central Italy as Revealed by One-Tube One-Step RT-PCR”, Phytopathologia Mediterranea, 44(3), pp. 322–326. doi: 10.14601/Phytopathol_Mediterr-1807.