Kimberling, 2004. Kimberling, Clark (2004), «Ordering words and sets of numbers: the Fibonacci case», en 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, MR2076798, doi:10.1007/978-0-306-48517-6_14..
Kimberling, 2004. Kimberling, Clark (2004), «Ordering words and sets of numbers: the Fibonacci case», en 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, MR2076798, doi:10.1007/978-0-306-48517-6_14..