Enhancing symbolic image classification through Gaussian copulas and optimized distinguishing points - Sri Winarni; Sapto Wahyu Indratno; Mohd Shahizan Othman; Siti Zaiton Mohd Hashim; Mohd Murtadha Mohamad; Apri Junaidi; Ebenezer Bonyah; Anindya Apriliyanti Pravitasari; Triyani Hendrawati; Irlandia Ginanjar (PLoS ONE, 2026)