Leonid Golinskii Stefano Serra Capizzano The asymptotic properties of the spectrum of nonsymmetrically perturbed Jacobi matrix sequences. 84-102 2007 144 Journal of Approximation Theory 1 http://dx.doi.org/10.1016/j.jat.2006.05.002 db/journals/jat/jat144.html#GolinskiiC07