Title: Elementary abelian subgroups in some special p-groups,
Abstract: Let $P$ be a finite $p$-group and $p$ be an odd prime. Let
$\mathcal{A}_p(P)_{\geq2}$ be a poset consisting of elementary abelian
subgroups of rank at least 2. If the derived subgroup $P'\cong C_p\times C_p$,
then the spheres occurring in $\mathcal{A}_p(P)_{\geq2}$ all have the same
dimension.