On a Cognitive Search Strategy. - Per Ahlgren (CoLIS, 1999)

Requirements for a cocitation similarity measure, with special reference to Pearson's correlation coefficient. - Per Ahlgren; Bo Jarneving; Ronald Rousseau 001 (J. Assoc. Inf. Sci. Technol., 2003)

Author cocitation analysis and Pearson's r. - Per Ahlgren; Bo Jarneving; Ronald Rousseau 001 (J. Assoc. Inf. Sci. Technol., 2004)

Rejoinder: In defense of formal methods. - Per Ahlgren; Bo Jarneving; Ronald Rousseau 001 (J. Assoc. Inf. Sci. Technol., 2004)

Retrieval evaluation with incomplete relevance data: a comparative study of three measures. - Per Ahlgren; Leif Grönqvist (CIKM, 2006)

Swedish full text retrieval: Effectiveness of different combinations of indexing strategies with query terms. - Per Ahlgren; Jaana Kekäläinen (Inf. Retr., 2006)

Indexing strategies for Swedish full text retrieval under different user scenarios. - Per Ahlgren; Jaana Kekäläinen (Inf. Process. Manag., 2007)

Evaluation of retrieval effectiveness with incomplete relevance data: Theoretical and experimental comparison of three measures. - Per Ahlgren; Leif Grönqvist (Inf. Process. Manag., 2008)

Bibliographic coupling, common abstract stems and clustering: A comparison of two document-document similarity approaches in the context of science mapping. - Per Ahlgren; Bo Jarneving (Scientometrics, 2008)

Document-document similarity approaches and science mapping: Experimental comparison of five approaches. - Per Ahlgren; Cristian Colliander (J. Informetrics, 2009)

Measuring impact of twelve information scientists using the DCI index. - Per Ahlgren; Kalervo Järvelin (J. Assoc. Inf. Sci. Technol., 2010)

The effects and their stability of field normalization baseline on relative performance with respect to citation impact: A case study of 20 natural science departments. - Cristian Colliander; Per Ahlgren (J. Informetrics, 2011)

Field normalized citation rates, field normalized journal impact and Norwegian weights for allocation of university research funds. - Per Ahlgren; Cristian Colliander; Olle Persson (Scientometrics, 2012)

Experimental comparison of first and second-order similarities in a scientometric context. - Cristian Colliander; Per Ahlgren (Scientometrics, 2012)

Geographical distance in bibliometric relations within epistemic communities. - Per Ahlgren; Olle Persson; Robert J. W. Tijssen (Scientometrics, 2013)

The correlation between citation-based and expert-based assessments of publication channels: SNIP and SJR vs. Norwegian quality assessments. - Per Ahlgren; Ludo Waltman (J. Informetrics, 2014)

Grading Countries/Territories Using DEA Frontiers. - Guoliang Yang; Per Ahlgren; Liying Yang; Ronald Rousseau 001; Jie-lan Ding (ISSI, 2015)

Bibliometric analysis of two subdomains in philosophy: free will and sorites. - Per Ahlgren; Peter Pagin; Olle Persson; Maria Svedberg (Scientometrics, 2015)

Using multi-level frontiers in DEA models to grade countries/territories. - Guoliang Yang; Per Ahlgren; Liying Yang; Ronald Rousseau 001; Jie-lan Ding (J. Informetrics, 2016)

Document Type Profiles in Nature, Science, and PNAS: Journal and Country Level. - Jie-lan Ding; Per Ahlgren; Liying Yang; Ting Yue (J. Data Inf. Sci., 2017)

Reply to 'Comment on "Using multi-level frontiers in DEA models to grade countries/territories" by G.-l. Yang et al. [Journal of Informetrics 10(1) (2016), 238-253]'. - Guoliang Yang; Per Ahlgren; Liying Yang; Ronald Rousseau 001; Jie-lan Ding (J. Informetrics, 2017)

Evolution of three Nobel Prize themes and a Nobel snub theme in chemistry: a bibliometric study with focus on international collaboration. - Sichao Tong; Per Ahlgren (Scientometrics, 2017)

Exploring the relation between referencing practices and citation impact: A large-scale study based on Web of Science data. - Per Ahlgren; Cristian Colliander; Peter Sjögårde (J. Assoc. Inf. Sci. Technol., 2018)

A comparison of citation disciplinary structure in science between the G7 countries and the BRICS countries. - Ting Yue; Liying Yang; Per Ahlgren; Jie-lan Ding; Shuangqing Shi; Rainer Frietsch (J. Data Inf. Sci., 2018)

Granularity of algorithmically constructed publication-level classifications of research publications: Identification of topics. - Peter Sjögårde; Per Ahlgren (J. Informetrics, 2018)

Disciplinary structures in Nature, Science and PNAS: journal and country levels. - Jie-lan Ding; Per Ahlgren; Liying Yang; Ting Yue (Scientometrics, 2018)

Community Detection Using Citation Relations and Textual Similarities in a Large Set of PubMed Publications. - Per Ahlgren; Yunwei Chen; Cristian Colliander; Nees Jan van Eck (ISSI, 2019)

How does author ethnic diversity affect scientific impact? A study of nanoscience and nanotechnology. - Jie-lan Ding; Zhesi Shen; Per Ahlgren; Tobias Jeppsson; David Minguillo (ISSI, 2019)

Comparison of publication-level approaches to ex-post citation normalization. - Cristian Colliander; Per Ahlgren (Scientometrics, 2019)

Enhancing direct citations: A comparison of relatedness measures for community detection in a large set of PubMed publications. - Per Ahlgren; Yunwei Chen; Cristian Colliander; Nees Jan van Eck (Quant. Sci. Stud., 2020)

Granularity of algorithmically constructed publication-level classifications of research publications: Identification of specialties. - Peter Sjögårde; Per Ahlgren (Quant. Sci. Stud., 2020)

Uncertainty and the ranking of economics journals. - Johan Lyhagen; Per Ahlgren (Scientometrics, 2020)

Algorithmic labeling in hierarchical classifications of publications: Evaluation of bibliographic fields and term weighting approaches. - Peter Sjögårde; Per Ahlgren; Ludo Waltman (J. Assoc. Inf. Sci. Technol., 2021)

The link between ethnic diversity and scientific impact: the mediating effect of novelty and audience diversity. - Jie-lan Ding; Zhesi Shen; Per Ahlgren; Tobias Jeppsson; David Minguillo; Johan Lyhagen (Scientometrics, 2021)

Normalization of direct citations in publication-level networks: Evaluation of six approaches. - Peter Sjögårde; Per Ahlgren (CoRR, 2023)

Normalization of direct citations for clustering in publication-level networks: evaluation of six approaches. - Peter Sjögårde; Per Ahlgren (Scientometrics, 2024)

Seed-based information retrieval in networks of research publications: Evaluation of direct citations, bibliographic coupling, co-citations, and PubMed-related article score. - Peter Sjögårde; Per Ahlgren (J. Assoc. Inf. Sci. Technol., 2024)