@article{Vorob’ev_Tsarev_2010, title={On the modularity of a lattice of $τ$-closed $n$-ultiply $ω$-composite formations}, volume={62}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/2879}, abstractNote={Let $n ≥ 0$, let $ω$ be a nonempty set of prime numbers and let $τ$ be a subgroup functor (in Skiba’s sense) such that all subgroups of any finite group $G$ contained in $τ (G)$ are subnormal in $G$. It is shown that the lattice of all $τ$-closed $n$-multiply $ω$-composite formations is algebraic and modular.}, number={4}, journal={Ukrains’kyi Matematychnyi Zhurnal}, author={Vorob’ev, N. N. and Tsarev, A. A.}, year={2010}, month={Apr.}, pages={453–463} }