I. Husein and R. Widyasari, “Algorithm Symmetric 2-DLDA for Recognizing Handwritten Capital Letters”, MATRIK : Jurnal Manajemen, Teknik Informatika dan Rekayasa Komputer, vol. 21, no. 2, pp. 389–402, Mar. 2022, doi: 10.30812/matrik.v21i2.1254.