Akoushideh, Alireza; Mazloom-Nezhad Maybodi, Babak: 'Efficient levels of spatial pyramid representation for local binary patterns', IET Computer Vision, 2015, 9, (6), p. 871-883, DOI: 10.1049/iet-cvi.2015.0028
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1xaojpflpnb58.x-iet-live-01content/journals/10.1049/iet-cvi.2015.0028