D. J.  Colgan, McLauchlan, A., Wilson, G. D. F., Livingston, S. P., Edgecombe, G. D., Macaranas, J., Cassis, G., and Gray, M. R., ?Histone H3 and U2 snRNA DNA sequences and arthropod molecular evolution?, vol. 46, no. 5, pp. 419 - 437, 1998.