Mapurunga, Patrícia Vasconcelos Rocha, et al. “ Determinants of Disclosure Level of Derivative Financial Instruments by Brazilian Public Companies ”. Revista Contabilidade & Finanças, vol. 22, no. 57, Dec. 2011, pp. 263-78, https://doi.org/10.1590/S1519-70772011000300003.