@article{marquetti_2007,  title={A cross-country non parametric estimation of the returns to factors of production and the elasticity of scale},  volume={17},  ISSN={0103-6351},  url={https://doi.org/10.1590/S0103-63512007000100004},  DOI={10.1590/S0103-63512007000100004},  number={1},  journal={Nova Economia},  publisher={Nova Economia},  author={Marquetti, Adalmir},  year={2007},  month={Jan},  pages={95–126} }