1. The Psycho-Biology of Languages;Zipf,1935
2. The Advanced Theory of Language as Choice and Chance;Herdan,1966
3. Information Retrieval: Computational and Theoretical Aspects;Heaps,1978
4. Die Architektonik des Deutschen Wortschatzes;Menzerath,1954
5. Prolegomena to Menzerath’s law;Altmann;Glottometrika,1980