@phdthesis{Li2006,
  author    = {Li, Xianhua},
  title     = {Arithmetic properties and the characterization of finite groups},
  address   = {Potsdam},
  pages     = {X, 186 S. : graph. Darst.},
  year      = {2006},
  language  = {en}
}
@article{LiXu2006,
  author    = {Li, Xianhua and Xu, Mingyao},
  title     = {The primitive permutation groups of degree 2(a)center dot 3(b)},
  issn      = {0003-889X},
  doi       = {10.1007/s00013-005-1494-8},
  year      = {2006},
  abstract  = {In this paper, we give a complete classification of all finite simple groups with maximal subgroups of index n, where n = 2(a)center dot 3b for a, b >= 1. As a consequence, for such n, all primitive permutation groups of degree n are given. The motivation of this work comes also from a study of Cayley graphs of certain valency on a finite simple group},
  language  = {en}
}