Zhou, D.; Shen, X.; Dong, W.: 'Image zooming using directional cubic convolution interpolation', IET Image Processing, 2012, 6, (6), p. 627-634, DOI: 10.1049/iet-ipr.2011.0534
IET Digital Library, https://digital-library.theiet.org/;jsessionid=28ix0uact43rb.x-iet-live-01content/journals/10.1049/iet-ipr.2011.0534