Asmussen, K., Fournier, K. B., Laming, J. M., Neu, R., Seely, J. F., Dux, R., et al. (1998). Spectroscopic investigations of tungsten in the EUV region and the determination of its concentration in tokamaks. Nuclear Fusion, 38(7), 967-986. doi:10.1088/0029-5515/38/7/302.