[Abry2003] C. Abry. 2003. [b]-[d]-[g] as a universal triangle as acoustically optimal as [i]-[a]-[u]. 15th Int. Congr. Phonetics Sciences ICPhS, 727-730.

[Adamic and Huberman2000] L. A. Adamic and B. A. Huberman. 2000. The nature of markets in the World Wide Web. Quarterly Journal of Electronic Commerce 1, 512.

[Albert and BarabŽasi2002] R. Albert and A.-L. BarabŽasi. 2002. Statistical mechanics of complex networks. Reviews of Modern Physics 74, 47-97.

[BarabŽasi and Albert1999] A.-L. BarabŽasi and R. Albert. 1999. Emergence of scaling in random networks. Science 286, 509-512.

[de Boer2000] Bart de Boer. 2000. Self-Organisation in Vowel Systems. Journal of Phonetics, Elsevier.

[Boersma1998] P. Boersma. 1998. Functional Phonology. (Doctoral thesis, University of Amsterdam), The Hague: Holland Academic Graphics.

[Bulmer1979] M. G. Bulmer. 1979. Principles of Statistics, Mathematics.

[Cancho et al.2001] Ferrer i Cancho and R. V. SolŽe. 2001. Santa Fe working paper 01-03-016.

[Chomsky and Halle1968] N. Chomsky and M. Halle. 1968. The Sound Pattern of English, New York: Harper and Row.

[Clements2004] N. Clements. 2004. Features and Sound Inventories. Symposium on Phonological Theory: Representations and Architecture, CUNY.

[Flemming2002] E. Flemming. 2002. Auditory Representations in Phonology, New York and London: Routledge.

[Gomes et al.1999] M. A. F. Gomes, G. L. Vasconcelos, I. J. Tsang, and I. R. Tsang. 1999. Scaling relations for diversity of languages. Physica A, 271, 489.

[Greenberg1966] J. H. Greenberg. 1966. Language Universals with Special Reference to Feature Hierarchies, The Hague Mouton.

[Grossman et al.1995] J. W. Grossman and P. D. F. Ion. 1995. On a portion of the well-known collaboration graph. Congressus Numerantium, 108, 129-131.

[Hinskens and Weijer2003] F. Hinskens and J. Weijer. 2003. Patterns of segmental modification in consonant inventories: a cross-linguistic study. Linguistics.

[Jakobson1941] R. Jakobson. 1941. Kindersprache, Aphasie und allgemeine Lautgesetze, Uppsala, Reprinted in Selected Writings I. Mouton, The Hague, 1962, pages 328-401.

[Jeong et al.2000] H. Jeong, B. Tombor, R. Albert, Z. N. Oltvai, and A. L. BarabŽasi. 2000. The largescale organization of metabolic networks. Nature, 406:651-654.

[Jakobson and Halle1956] R. Jakobson and M. Halle. 1956. Fundamentals of Language, The Hague: Mouton and Co.

[Ladefoged and Maddieson1996] P. Ladefoged and I. Maddieson. 1996. Sounds of the Worlds Languages, Oxford: Blackwell.

[Lindblom and Maddieson1988] B. Lindblom and I. Maddieson. 1988. Phonetic Universals in Consonant Systems. In L.M. Hyman and C.N. Li, eds., Language, Speech, and Mind, Routledge, London, 62-78.

[Lotka1926] A. J. Lotka. 1926. The frequency distribution of scientific production. J. Wash. Acad. Sci. 16, 317-323.

[Maddieson1984] I. Maddieson. 1984. Patterns of Sounds, Cambridge University Press, Cambridge.

[Martinet1968] A. Martinet. 1968. Phonetics and linguistic evolution. In Bertil Malmberg (ed.), Manual of phonetics, revised and extended edition, Amsterdam: North-Holland Publishing Co. 464-487.

[Newman2001b] M. E. J. Newman. 2001b. Scientific collaboration networks. I and II. Phys. Rev., E 64.

[Newman2003] M. E. J. Newman. 2003. The structure and function of complex networks. SIAM Review 45, 167-256.

[Pericliev and ValdŽes-PŽerez2002] V. Pericliev, R. E. ValdŽes-PŽerez. 2002. Differentiating 451 languages in terms of their segment inventories. Studia Linguistica, Blackwell Publishing.

[Pinker1994] S. Pinker. 1994. The Language Instinct, New York: Morrowo.

[Ramasco et al.2004] JosŽe J. Ramasco, S. N. Dorogovtsev, and Romualdo Pastor-Satorras. 2004. Selforganization of collaboration networks. Physical Review E, 70, 036106.

[Simon1955] H. A. Simon. 1955. On a class of skew distribution functions. Biometrika 42, 425-440.

[Trubetzkoy1969/1939] N. Trubetzkoy. 1969. Principles of phonology. (English translation of Grundzšuge der Phonologie, 1939), Berkeley: University of California Press.

[Vitevitch2005] M. S. Vitevitch. 2005. Phonological neighbors in a small world: What can graph theory tell us about word learning? Spring 2005 Talk Series on Networks and Complex Systems, Indiana University, Bloomington.

[Wang1968] William S.-Y. Wang. 1968. The basis of speech, Project on Linguistic Analysis Reports, University of California at Berkeley. Reprinted in The Learning of Language, ed. by C. E. Reed, 1971.

[Yook et al.2001b] S. Yook, H. Jeong and A.-L. BarabŽasi. 2001b. preprint.

[Zipf1949] G. K. Zipf. 1949. Human Behaviour and the Principle of Least Effort, Addison-Wesley, Reading, MA.