8ACI EUROPE, YORK Consulting. Creating Employment And Prosperity in Europe: An Economic Impact Study Kit. http://www.aci-europe.org/upload/Economic%20Impact%20Study%20Kit%20-%20Feb%202000.pdf.2002: 10-11
9Granger, C.W.J. and Newbold, P.. Spurious regression in econometrics. Journal of Econometrics, 1974(2): 111-120