The Structure of $G/\Phi(G)$ in Terms of $\sigma(G)$
  Let $G$ be a finite group. We let $\f{m}(G)$ and $\sig(G)$ denote the number of maximal subgroups of $G$ and the least positive integer $n$ such that $G$ is written as the union of $n$ proper subgroups, respectively. In this paper we determine the structure of $G/\Phi(G)$ when $G$ is a finite soluble group with $\f{m}(G)\leq 2\sig(G)$. 
Alireza Jamali and Hamid Mousavi