"Spatio-temporal scale selection in video data". Journal of Mathematical Imaging and Vision. 60 (4). pp. 525–562. doi:10.1007/s10851-017-0766-9. ↑ Lindeberg, T. (1991) Discrete Scale-Space Theory and the Scale-Space Primal Sketch, PhD thesis, Department of Numerical Analysis and Computing Science, Royal Institute of Technology, S-100 44 Stockholm, Sweden, May 1991.