FOCES - a fibre optics Cassegrain échelle spectrographM. J. Pfeiffer, C. Frank, D. Baumüller, K. Fuhrmann and T. GehrenAstron. Astrophys. Suppl. Ser., 130 2 (1998) 381-393DOI: https://doi.org/10.1051/aas:1998231