@article{PFMT_2011_3_a14,
     author = {A. A. Tsarev},
     title = {On non-distributivity of the lattice of all $n$-multiply $\omega$-composition formations},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {84--88},
     publisher = {mathdoc},
     number = {3},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2011_3_a14/}
}