G. Misguich and C. Lhuillier, Frustration in Two-Dimensional Quantum Antiferromagnets, 2003.

F. Bert, D. Bono, P. Mendels, and J. Trombe, = 1/2 frustrated magnet: a ??SR and NMR study, Journal of Physics: Condensed Matter, vol.16, issue.11, p.829, 2004.
DOI : 10.1088/0953-8984/16/11/037