Teguh Yoga Raksa and Budhy Kurniawan 2002. MAGNETIC PROPERTIES OF THE TWO-LEG ZIG-ZAG LADDER IN QUANTUM SPIN SYSTEM NH4CuCl3. Jurnal Sains Materi Indonesia. 3, 2 (Feb. 2002), 102–105. DOI:https://doi.org/10.17146/jusami.2002.3.2.5252.