African regional innovation systems: bibliometric analysis of research collaboration patterns 2005-2009. - Hannes Toivanen; Branco Ponomariov (Scientometrics, 2011)

The shift from theory to innovation: the evolution of Brazilian research frontiers 2005-2011. - Hannes Toivanen (Technol. Anal. Strateg. Manag., 2014)

Map of science with topic modeling: Comparison of unsupervised learning and human-assigned subject classification. - Arho Suominen; Hannes Toivanen (J. Assoc. Inf. Sci. Technol., 2016)