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2. Arrow KJ (1963) Social choice and individual values, 2nd edn. Yale University Press, New Haven
3. BASF (2010) Headline® fungicide eco-efficiency analysis final report – August 2010, available at: http://www.nsf.org/newsroom_pdf/BASF_Headline_EEA_Study_Verification_Final__August_2010.pdf (9.6.15)
4. BASF (2015a) Homepage “eco-efficiency analysis”, available at: https://www.basf.com/en/company/sustainability/management-and-instruments/quantifying-sustainability/eco-efficiency-analysis.html (9.6.15)
5. BASF (2015b) Homepage “making headlines—corn grown with or without BASF fungicide, Headline®”, available at: http://www.agro.basf.com/agr/AP-Internet/en/content/sustainability/eco-efficiency-analysis/case-study-corn-grown-with-or-without-BASF-fungicide-headline (9.6.15)