APA   Click to copy
Carstens, J., Maftei, A., & Mascherini, M. (2021). Regional convergence and inequalities.

Chicago/Turabian   Click to copy
Carstens, Jens, Anamaria Maftei, and Massimiliano Mascherini. Regional Convergence and Inequalities, 2021.

MLA   Click to copy
Carstens, Jens, et al. Regional Convergence and Inequalities. 2021.

@techreport{jens2021a,
  title = {Regional convergence and inequalities},
  year = {2021},
  author = {Carstens, Jens and Maftei, Anamaria and Mascherini, Massimiliano}
}