Silva, Guilherme Ricardo dos Santos Souza e. “Negative Interest Rates and Forward Curve Inversion: An Interpretation in the Light of Liquidity Preference Theory”. Economia E Sociedade, vol. 30, no. 3, Dec. 2021, pp. 897-25, https://periodicos.sbu.unicamp.br/ojs/index.php/ecos/article/view/8668817.