R. K. Sampangi, Almeyda, C., Druffel, K. L., S. Mohan, K., Shock, C. C., and Pappu, H. R.,
“First Report of Natural Infection of Penstemon acuminatus with Cucumber mosaic virus in the Treasure Valley Region of Idaho and Oregon”,
Plant Disease, vol. 93, no. 7, pp. 762 - 762, 2009.