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The papers in this issue are based on the selected and peer-reviewed papers from the 17th International Symposium on Operations Research in Slovenia \u2013 SOR\u201923, which took place in Bled, Slovenia (<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/arhiv.fov.um.si\/sor23\/\" ext-link-type=\"uri\">https:\/\/arhiv.fov.um.si\/sor23\/<\/jats:ext-link>), September 20\u201322, 2023. In addition, we examined the 27 research papers in the last two SSI-SOR CEJOR special issues, 16 in the Cent Eur J Oper Res 31, issue 3, 2023, and 11 in this CEJOR special issue, and grouped them into clusters using keywords according to the methodology published by Kastrin et al. (2021) Methodologies and applications for resilient global development from the aspect of SDI-SOR. The clusters show the main and niche topics presented and, on the one hand, illustrate the European and international state of the art in the field of OR over the last five years and, on the other hand, can serve as a stimulus for further work on upcoming strategic OR topics.<\/jats:p>","DOI":"10.1007\/s10100-025-00989-6","type":"journal-article","created":{"date-parts":[[2025,6,9]],"date-time":"2025-06-09T14:55:18Z","timestamp":1749480918000},"page":"631-640","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Recent theoretical and practical contributions to the OR environment and CEJOR from the perspective of SSI-SOR"],"prefix":"10.1007","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9856-1476","authenticated-orcid":false,"given":"Janez","family":"Povh","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9776-7766","authenticated-orcid":false,"given":"Lidija","family":"Zadnik Stirn","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6041-1106","authenticated-orcid":false,"given":"Janez","family":"\u017derovnik","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2025,6,9]]},"reference":[{"key":"989_CR1","doi-asserted-by":"publisher","DOI":"10.1007\/s10100-025-00963-2","author":"MP Bach","year":"2025","unstructured":"Bach MP, \u017dmuk B, Stjepi\u0107 AM et al (2025) Citizen-centric insights into e-democracy and e-government: hybrid approach using cluster and multiple regression analysis. 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