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"Citation classics" are not only highly cited, but also cited during severaldecades. We test whether the peaks in the spectrograms generated by ReferencePublication Years Spectroscopy (RPYS) indicate such long-term impact bycomparing across RPYS for subsequent time intervals. Multi-RPYS enables us todistinguish between short-term citation peaks at the research front that decaywithin ten years versus historically constitutive (long-term) citations thatfunction as concept symbols (Small, 1978). Using these constitutive citations,one is able to cluster document sets (e.g., journals) in terms ofintellectually shared histories. We test this premise by clustering 40 journalsin the Web of Science Category of Information and Library Science usingmulti-RPYS. It follows that RPYS can not only be used for retrieving roots ofsets under study (cited), but also for algorithmic historiography of the citingsets. Significant references are historically rooted symbols among othercitations that function as currency.

Identification of long-term concept-symbols among citations: Can documents be clustered in terms of common intellectual histories?