Aparecido Cardoso, João Antonio, Felipe Takeshi Ishizu, Jeferson Tadeu de Lima, and Jefferson de Souza Pinto. 2019. “Blockchain Based MFA Solution: The Use of Hydro Raindrop MFA for Information Security on WordPress Websites”. Brazilian Journal of Operations & Production Management 16 (2):281-93. https://doi.org/10.14488/BJOPM.2019.v16.n2.a9.