Zaharko, O.; Ronnow, ,H.M.; Daoud-Aladine, A.; Streule, S.; Juranyi, F.; Mesot, J.; Berger, H.; Brown, P. Incommensurate Magnetism in the Coupled Spin Tetrahedra System Cu₂Te₂O₅Cl₂. Fiz. Nizk. Temp. 2005, 31, 1068-1072.