%0 Journal Article %A Xu, Xia %A Yang, Yong %T Results related to Huppert's $\rho $-$\sigma $ conjecture %J Czechoslovak Mathematical Journal %D 2023 %P 1273-1280 %V 73 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.2023.0513-22/ %R 10.21136/CMJ.2023.0513-22 %G en %F 10_21136_CMJ_2023_0513_22