Ayala, Alejandro, and M. W. Allen. “Transmission of the California Tobacco Rattle Virus (CTRV) by Three Species of the Nematode Genus Trichodorus”. The Journal of Agriculture of the University of Puerto Rico, vol. 52, no. 2, Apr. 1968, pp. 101-25, doi:10.46429/jaupr.v52i2.11497.