Loa, I., Schwarz, U., Hanfland, M., Kremer, R. K., & Syassen, K. (1999). Crystal Structure and Optical Spectroscopy of NaV2O5 under Pressure. Physica Status Solidi (B), 215, 709-714. doi:10.1002/(SICI)1521-3951(199909)215:1<709:AID-PSSB709>3.0.CO;2-4.