@article{Liu2023, 
author = {Shitian Liu and Runshi Zhang},
title = {Finite groups all of whose proper subgroups have few character values},
year = {2023},
journal = {AIMS Mathematics},
volume = {8},
number = {4},
pages = {9074-9081},
keywords = {simple group, character value, proper subgroup},
url = {https://www.sciopen.com/article/10.3934/math.2023454},
doi = {10.3934/math.2023454},
abstract = {In this paper, the structures of non-solvable groups whose all proper subgroups have at most seven character values are identified.}
}