KORUDU SUREKHA, ARCHEK PRAVEEN KUMAR, CHEKURI MAHESH, MADGULA MAHESH, YERAMALA KALAVATHI. Digital Image Watermarking Using RDWT with SVD and Firefly Algorithms. International Journal of Advanced Science and Technology, v. 29, n. 05, p. 9246-9250, 28 May 2020.