Open charm contribution to dilepton spectra produced in nuclear collisions at SPS energies P. Braun-Munzinger, D. Miśkowiec, A. Drees and C. Lourenço Eur. Phys. J. C, 1 1-2 (1998) 123-130 Published online: 27 February 2005 DOI: 10.1007/BF01245802