Yohei Saika and  Hiroki Sakaematsu and  Shota Akiyama,  Bayesian Inference for Phase Unwrapping Using Conjugate Gradient Method in One and Two Dimensions.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    December 2012, vol. 72(12). 1682 - 1687
    [viewed 15 October 2019]. Available from: https://publications.waset.org/pdf/9598.