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- [6] On levels of the one-dimensional Schrodinger operator on the boundary of the essential spectrum IZVESTIYA INSTITUTA MATEMATIKI I INFORMATIKI-UDMURTSKOGO GOSUDARSTVENNOGO UNIVERSITETA, 2006, (02): : 91 - 94
- [8] On levels of the one-dimensional Schrodinger operator on the boundary of the essential spectrum IZVESTIYA INSTITUTA MATEMATIKI I INFORMATIKI-UDMURTSKOGO GOSUDARSTVENNOGO UNIVERSITETA, 2005, (01): : 107 - 112