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), pp. 102–105. doi: 10.17146/jusami.2002.3.2.5252.