@article{alías_palmer_2001,  title={A duality result between the minimal surface equation and the maximal surface equation},  volume={73},  ISSN={0001-3765},  url={https://doi.org/10.1590/S0001-37652001000200002},  DOI={10.1590/S0001-37652001000200002},  number={2},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={ALÍAS, LUIS J. and PALMER, BENNETT},  year={2001},  month={Jun},  pages={161–164} }