@article{VTGU_2015_3_a1,
     author = {V. M. Zyuz'kov},
     title = {Sufficient conditions for the existence of undecidable indirectly reflective sentences},
     journal = {Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika},
     pages = {12--17},
     publisher = {mathdoc},
     number = {3},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTGU_2015_3_a1/}
}