Walk ST, Xu G, Stull JW, Rich SM.  2009.  Correlation between tick density and pathogen endemicity, New Hampshire.. Emerg Infect Dis. 15(4):585-7.

Caporale DA, Rich SM, Spielman A, Telford SR, Kocher TD.  1995.  Discriminating between Ixodes ticks by means of mitochondrial DNA sequences.. Mol Phylogenet Evol. 4(4):361-5.