Stephan Didas, Gabriele Steidl, and Joachim Weickert. “Integrodifferential Equations for Multiscale Wavelet Shrinkage: The Discrete Case”. International Journal of Electrical and Computer Engineering Systems, vol. 1, no. 1, June 2010, pp. 1-17, https://ijeces.ferit.hr/index.php/ijeces/article/view/896.