Subring subgroups in symplectic groups in characteristic 2

@article{Bak2015SubringSI,
  title={Subring subgroups in symplectic groups in characteristic 2},
  author={Anthony Bak and A. Stepanov},
  journal={arXiv: Rings and Algebras},
  year={2015}
}
In 2012 the second author obtained a description of the lattice of subgroupsof a Chevalley group $G(\Phi,A)$, containing the elementary subgroup $E(\Phi,K)$ over a subring $K\subseteq A$ provided $\Phi=B_n,$ $C_n$ or $F_4$, $n\ge2$, and $2$ is invertible in $K$. It turns out that this lattice splits into a disjoint union of "sandwiches", parametrized by intermediate subrings between $K$ and $A$. In the current article a similar result is proved for $\Phi=B_n$ or $C_n$, $n\ge3$, and $2=0$ in $K… 
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