Executive Order 13112 of February 3, 1999, Invasive Species Federal Register 64, no. 25, February 8,1999, Presidential Documents 6183.
15
Vermeij G. J. Invasion as Expectation: A Historical Fact of Life // Species Invasions: Insights into Ecology, Evolution, and Biogeography. Sunderland, MA: Sinauer Associates. 2005, 315–339.
