ASTRAUSKAS, Arvydas. On the boundary part spectrum of the discrete Schrödinger operator. Lietuvos matematikos rinkinys, [S. l.], v. 40, n. spec., p. 126–131, 2000. DOI: 10.15388/LMR.2000.35076. Disponível em: https://www.journals.vu.lt/LMR/article/view/35076.. Acesso em: 17 jul. 2024.