K. Subba Reddy, V. Vijaya Kumar, and A. P. Siva Kumar, “Texture Classification based on First Order Circular and Elliptical Ternary Direction Pattern Matrix”, IJET, vol. 7, no. 3.27, pp. 601–608, Aug. 2018, doi: 10.14419/ijet.v7i3.27.18504.