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Kimberling (2004). Kimberling, Clark (2004), "Ordering words and sets of numbers: the Fibonacci case", in Howard, Frederic T. (ed.), Applications of Fibonacci Numbers, Volume 9: Proceedings of The Tenth International Research Conference on Fibonacci Numbers and Their Applications, Dordrecht: Kluwer Academic Publishers, pp. 137–144, doi:10.1007/978-0-306-48517-6_14, ISBN978-90-481-6545-2, MR2076798.