JASIM, Abbas A. Gray Scale Image Hiding Using Wavelet Packet Transform. Iraqi Journal for Electrical and Electronic Engineering, [S. l.], v. 5, n. 1, p. 51–59, 2009. DOI: 10.37917/ijeee.5.1.5. Disponível em: https://ijeee.edu.iq/ijeee/article/view/56. Acesso em: 8 dec. 2025.