Gavilano, J. L., Felder, E., Rau, D., Ott, H. R., Millet, P., Mila, F., et al. (2005). Unusual magnetic properties of the low-dimensional quantum magnet Na2V3O7. Physical Review B, 72: 064431, pp. 064431-1-064431-10. doi:10.1103/PhysRevB.72.064431.