Measurements of BR(b $\to \tau^- \bar{\nu}_{\tau}$ X) and BR(b $\to \tau^- \bar{\nu}_{\tau}{\mathrm D}^{\ast\pm}$ X) and upper limits on BR(B $^- \to \tau^- \bar{\nu}_{\tau})$ and BR(b $\to{\mathrm s} \nu \bar{\nu})$
European physical journal. C, Particles and fields