TIWARI, JAGESH K, et al. “Molecular Markers of Ryadg Gene and Serological Assay Reveal Potato Virus Y (PVY) Resistance in the Tetraploid Indian Potato (Solanum Tuberosum) Germplasm”. The Indian Journal of Agricultural Sciences, vol. 83, no. 4, Apr. 2013, https://epubs.icar.org.in/index.php/IJAgS/article/view/28838.