Risch, S.M., Rosenthal, B.M., Telford, S.R., Spielman, A., Hartl, D.L. and Ayala, F.J. (1997) Heterogeneity of the Internal Transcribed Spacer (ITS-2) Region within Individual Deer Ticks. Insect Molecular Biology, 6, 123-129.
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2583.1997.tb00080.x/abstract