Correction to: Improvement of similarity–diversity trade-off in recommender systems based on a facility location model

The article” Improvement of similarity–diversity trade-off in recommender systems based on a facility location model”, written by Antiopi Panteli and Basilis Boutsinas, was originally published electronically on the publisher’s internet portal on [2 January 2021] without open access. With the author(s)’ decision to opt for Open Choice the copyright of the article changed on January 27 to © The Authors 2022 and the article is forthwith distributed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://​creativecommons.​org/​licenses/​by/​4.​0.