Alam, Shahzad, et al. “A Novel Hybrid Watermarking Scheme With Image Authentication Based on Frequency Domain, 2- Level SVD Using Chaotic Map”. EAI Endorsed Transactions on Energy Web, vol. 8, no. 31, July 2020, p. e7, https://doi.org/10.4108/eai.13-7-2018.165512.