T. T. M.  Vandekerckhove, Willems, A., Gillis, M., and Coomans, A., ?Occurrence of novel verrucomicrobial species, endosymbiotic and associated with parthenogenesis in Xiphinema americanum-group species (Nematoda, Longidoridae)?, International Journal of Systematic and Evolutionary MicrobiologyInternational Journal of Systematic and Evolutionary Microbiology, vol. 50, pp. 2197-2205, 2000.