New times of minima and ephemeris for several OB eclipsing binaries P. Mayer, P. G. Niarchos, R. Lorenz, M. Wolf and G. Christie Astron. Astrophys. Suppl. Ser., 130 2 (1998) 311-315 Published online: 15 June 1998 DOI: 10.1051/aas:1998223