p.136-144 in ....
Begon M., Harper J.L., Townsend C.R.; 1996; Ecology, Individuals, Populations and Communities, 3rd ed.; Blackwell Science; Oxford - UK;

p.141 in ....
Hughes et al., 1992: cited in Begon, 1996: see above;

p.965-966 in ....
Dorit R.L., Walker W.F., Barnes R.D.; 1991; Zoology; Saunders College Publishing,; Orlando (FL) - USA;

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