?url_ver=Z39.88-2004&rft_id=10.1073%2Fpnas.2402060121&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Koch&rft.aufirst=Philipp&rft.issue=N%C2%B0+39&rft.volume=Vol.+121&rft.date=16+September+2024&rft.issn=0027-8424&rft.atitle=Augmenting+the+availability+of+historical+GDP+per+capita+estimates+through+machine+learning&rft.title=Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America&rft.genre=article