@article{VTGU_2010_1_a2,
     author = {V. M. Zyuz'kov},
     title = {Undecidable indirectly reflexive sentences},
     journal = {Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika},
     pages = {21--33},
     year = {2010},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTGU_2010_1_a2/}
}