Doctoral Researchers in Mathematics, Operations Research, and Statistics at Aalto University
Department of Mathematics and Systems Analysis at Aalto University has an open call for PhD students:
https://www.aalto.fi/en/open-positions/doctoral-researchers-in-mathematics-operations-research-and-statistics
It is recommended to apply by December 31, 2022 and to clearly indicate in the cover letter the departmental research areas that interest you the most.