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We introduce the quantitative method named "reference publication yearspectroscopy" (RPYS). With this method one can determine the historical rootsof research fields and quantify their impact on current research. RPYS is basedon the analysis of the frequency with which references are cited in thepublications of a specific research field in terms of the publication years ofthese cited references. The origins show up in the form of more or lesspronounced peaks mostly caused by individual publications which are citedparticularly frequently. In this study, we use research on graphene and onsolar cells to illustrate how RPYS functions, and what results it can deliver.

Detecting the historical roots of research fields by reference publication year spectroscopy (RPYS)