Embryological development of pacemaker hierarchy and membrane currents related to the function of the adult sinus node: implications for autonomic modulation of biopacemakers. - Tobias Opthof (Medical Biol. Eng. Comput., 2007)

Scopus' SNIP Indicator - Loet Leydesdorff; Tobias Opthof (CoRR, 2010)

Scopus's source normalized impact per paper (SNIP) versus a journal impact factor based on fractional counting of citations. - Loet Leydesdorff; Tobias Opthof (J. Assoc. Inf. Sci. Technol., 2010)

Normalization at the field level: Fractional counting of citations. - Loet Leydesdorff; Tobias Opthof (J. Informetrics, 2010)

Caveats for the journal and field normalizations in the CWTS ("Leiden") evaluations of research performance. - Tobias Opthof; Loet Leydesdorff (J. Informetrics, 2010)

Normalizing the measurement of citation performance: Principles for comparing sets of documents - Loet Leydesdorff; Lutz Bornmann; Rüdiger Mutz; Tobias Opthof (CoRR, 2011)

Citation analysis cannot legitimate the strategic selection of excellence - Tobias Opthof; Loet Leydesdorff (CoRR, 2011)

Turning the tables on citation analysis one more time: Principles for comparing sets of documents. - Loet Leydesdorff; Lutz Bornmann; Rüdiger Mutz; Tobias Opthof (J. Assoc. Inf. Sci. Technol., 2011)

Scopus' SNIP indicator: Reply to Moed. - Loet Leydesdorff; Tobias Opthof (J. Assoc. Inf. Sci. Technol., 2011)

Remaining problems with the "New Crown Indicator" (MNCS) of the CWTS. - Loet Leydesdorff; Tobias Opthof (J. Informetrics, 2011)

Differences in citation frequency of clinical and basic science papers in cardiovascular research. - Tobias Opthof (Medical Biol. Eng. Comput., 2011)

A comment to the paper by Waltman et al., Scientometrics, 87, 467-481, 2011. - Tobias Opthof; Loet Leydesdorff (Scientometrics, 2011)

A rejoinder on energy versus impact indicators. - Loet Leydesdorff; Tobias Opthof (Scientometrics, 2012)

Citation analysis with medical subject Headings (MeSH) using the Web of Knowledge: A new routine. - Loet Leydesdorff; Tobias Opthof (J. Assoc. Inf. Sci. Technol., 2013)

Revisiting Relative Indicators and Provisional Truths. - Loet Leydesdorff; Tobias Opthof (CoRR, 2018)

hα: The Scientist as Chimpanzee or Bonobo. - Loet Leydesdorff; Lutz Bornmann; Tobias Opthof (CoRR, 2018)

hα: the scientist as chimpanzee or bonobo. - Loet Leydesdorff; Lutz Bornmann; Tobias Opthof (Scientometrics, 2019)