Spectral properties of Jacobi matrices by asymptotic analysis. - Jan Janas; Marcin Moszynski (J. Approx. Theory, 2003)

Infinite Jacobi Matrices with Unbounded Entries: Asymptotics of Eigenvalues and the Transformation Operator Approach. - Jan Janas; Serguei Naboko (SIAM J. Math. Anal., 2004)

The essential spectrum of some unbounded Jacobi matrices: A generalization of the Last-Simon approach. - Anne Boutet de Monvel; Jan Janas; Serguei Naboko (J. Approx. Theory, 2018)