The HELIOS series of advanced, synchrotron based, X-ray sources V. C. Kempson, A. R. Jorden, N. C. E. Crosland, M. N. Wilson, J. C. Schouten, M. C. Townsend et R. J. Anderson J. Phys. III France, 4 9 (1994) 1679-1686 DOI: 10.1051/jp3:1994233