@article{10_21136_CMJ_2023_0513_22,
     author = {Xu, Xia and Yang, Yong},
     title = {Results related to {Huppert's} $\rho $-$\sigma $ conjecture},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1273--1280},
     publisher = {mathdoc},
     volume = {73},
     number = {4},
     year = {2023},
     doi = {10.21136/CMJ.2023.0513-22},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.2023.0513-22/}
}