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Johnston, P.; Everard, M.; Santillo, D.; Robèrt, K. H. (2007). "Reclaiming the definition of sustainability". Environmental Science and Pollution Research International. 14 (1): 60–66. doi:10.1065/espr2007.01.375. PMID17352129.
Eriksson, K. E.; Robèrt, K. H. (1991). "From the Big Bang to sustainable societies". Acta Oncologica. 30 (6 Spec No): 5–14. PMID1910872.