Risteski, D. and Davcev, D. 2015. Do search engine data improve financial time series volatility predictions in different market periods? An empirical analysis on major world financial indices. INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY. 14, 5 (Mar. 2015), 5759–5768. DOI:https://doi.org/10.24297/ijct.v14i5.5275.