G. de L. Veras, M. J. Campos dos Santos, R. Sales Almendra, and D. P. da Silva, “Technological innovation, tax incentives and economic efficiency in the Brazilian scenario: Analysis of the case of the State of Piauí”, Int J Innov Educ Res, vol. 10, no. 4, pp. 166–180, Apr. 2022, doi: 10.31686/ijier.vol10.iss4.3720.