Jixin Liu and  Zheming Lu,  A Multipurpose Audio Watermarking Algorithm Based on Vector Quantization in DCT Domain.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2009, vol. 31(7). 1462 - 1467
    [viewed 28 February 2020]. Available from: https://publications.waset.org/pdf/14650.