Raventino, R., & Fran, F. (2026). DIGRUNDY NUMBER OF DIRECTED STAR, BANANA TREE, FIREWORKS, AND COCONUT TREE GRAPHS. BAREKENG: Jurnal Ilmu Matematika Dan Terapan, 20(4), 3213-3222. https://doi.org/10.30598/barekengvol20iss4pp3213-3222