Headley, J. C. (1972). Defining the economic threshold. In Pest Control Strategies for the Future (pp. 100 – 108). Washington, DC: National Academy of Science.
Hallegraeff, G. M., & Cembella, A. D. (Eds.) (2003). Manual on harmful marine microalgae. Paris: UNESCO.
Aiken, Michael, and Harold L. Sheppard (1996a): The classical approach to convergence analysis, The Economic Journal 106 (No. 437), 1019-1036
[2] P. B. Miranda; D. Kim; Y. R. Shen, Phys. Rev. B, 59 (1999) 12632-12640
Tavassoli, N. T. and J. K. Han: 2002, `Auditory and Visual Brand', Journal of International Marketing 10(2) 13–28.