Petra Bosilj Michael H. F. Wilkinson Ewa Kijak Sébastien Lefèvre Local 2D Pattern Spectra as Connected Region Descriptors. 2016 1 Math. Morphol. Theory Appl. 1 https://doi.org/10.1515/mathm-2016-0011 db/journals/mathm/mathm1.html#BosiljWKL16