Youtie, Jan, Porter, Alan L., Boyack, Kevin, Lobo, Jose, Klavan, Richard, Rafols, Ismael, et al. 2012. "Using Large-scale Databases to Understand the Trajectories of Emerging Technologies." Little by Little: Expansions of Nanoscience and Emerging Technologies, eds. H. Van Lente and C. Coenen, 55-58. Heidelberg: Akademische Verlagsgesellschaft.