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Walton, C. S.; CABI, Wallingford, UK, Weed risk assessment in Australia, 2004, pp unpaginated, 9 ref.
Wittenberg, R.; Cock, M. J. W.; CABI, Wallingford, UK, Invasive plant management, 2001, pp unpaginated, 4 ref.
Parker, C.; CABI, Wallingford, UK, Risk assessment of weeds, 2004, pp unpaginated, 47 ref.
Richardson, D. M.; Pyšek, P.; CABI, Wallingford, UK, What is an invasive species?, 2004, pp unpaginated, many ref.