Liang-Ta Cheng and Ching-Yu Yang, High Performance Electrocardiogram Steganography Based on Fast Discrete Cosine Transform. journal = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. June 2018, vol. 139(7). 509 - 514 [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10009202.