1. Allan, J., Carbonell, J., Doddington, G., et al.: Topic detection and tracking pilot study: final report. In: Proceedings of DARPA Broadcast News Transcription and Understanding Workshop, pp. 194–218 (1998)
2. Leydesdorff, L., Nerghes, A.: Co-word maps and topic modeling: A comparison using small and medium-sized corpora (N < 1,000). J. Assoc. Inf. Sci. Technol. 68(4), 1024–1035 (2017)
3. Rule, A., Cointet, J.P., Bearman, P.S.: Lexical shifts, substantive changes, and continuity in State of the Union discourse, 1790–2014. Proc. Natl. Acad. Sci. 112(35), 10837–10844 (2015)
4. Lu, L.Y., Liu, J.S.: A novel approach to identify the major research themes and development trajectory: the case of patenting research. Technol. Forecast. Soc. Change 103, 71–82 (2016)
5. Mauch, M., MacCallum, R.M., Levy, M., Leroi, A.M.: The evolution of popular music: USA 1960–2010. R. Soc. Open Sci. 2(5), 150081 (2015)