Lamovsky, D. V., R. K. Sadykhov, V. A. Kharlanov, and A. S. Kirienko. “COMBINED APPROACH FOR FACE FRONTAL VIEW ESTIMATION FOR REAL TIME FACES DETECTION IN MULTICAMERA SYSTEM”. International Journal of Computing, vol. 10, no. 3, Dec. 2011, pp. 209-15, doi:10.47839/ijc.10.3.750.