M.  Schratzberger and Warwick, R. M., ?Effects of Physical Disturbance On Nematode Communities in Sand and Mud - a Microcosm Experiment?, in Marine Biology, vol. 130, 1998, pp. 643?650.

R. M.  Warwick and Clarke, K. R., ?Taxonomic distinctness and environmental assessment?, Journal of Applied Ecology, vol. 35, pp. 532?543, 1998.