Study of $ B_{(s)}^0\to K_{\mathrm{S}}^0{h^{+}}{h^{{\prime -}}} $ decays with first observation of $ B_s^0\to K_{\mathrm{S}}^0{K^{\pm }}{\pi^{\mp }} $ and $ B_s^0\to K_{\mathrm{S}}^0{\pi^{+}}{\pi^{-}} $
The Journal of high energy physics/The journal of high energy physics