@article {Abreu:1992rv,
	title = {{Evidence for $B_s^0$ meson production in $Z^0$ decays}},
	journal = {Phys. Lett.},
	volume = {B289},
	year = {1992},
	pages = {199-210},
	doi = {10.1016/0370-2693(92)91385-M},
	author = {Abreu, P. and others}
}
