Vrigazova, Borislava. “Wavelet-Based Prediction of Stock Market Returns During 2008 Financial Crisis”. Vanguard Scientific Instruments in Management 12, no. 1 (November 8, 2017). Accessed February 8, 2025. https://www.vsim-journal.info/index.php?journal=vsim&page=article&op=view&path[]=117.