We are pleased to inform you that new international publication on the POPENVIROS project has been realized. Title of the article: The Effect of Hot Days on Birth Rates in Serbia: Regional Aspect Title of the journal: Spatial Demography DOI: https://doi.org/10.1007/s00484-025-02960-1 Cite this article: Mirić, N. The Effect of Hot Days on Birth Rates in Serbia: Regional Aspect. Spat Demogr 14, 2 (2026). https://doi.org/10.1007/s40980-025-00155-1 Read full paper: The Effect of Hot Days on Birth Rates in Serbia: Regional Aspect