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LEYDESDORFF, Loet. The Triple Helix, Quadruple Helix, …, and an N-Tuple of Helices: Explanatory Models for Analyzing the Knowledge-Based Economy?. Journal of the Knowledge Economy. 2012-03-01, roč. 3, čís. 1, s. 25–35. Dostupné online [cit. 2024-01-14]. ISSN1868-7873. DOI10.1007/s13132-011-0049-4. (anglicky)