KOKLU, Kevser; ALBAYRAK, Inci; BAYRAMOV, Azad. A regularized trace formula for second order differential operator equations. Mathematica Scandinavica, Berkeley, CA, United States, v. 107, n. 1, p. 123–138, 2010. DOI: 10.7146/math.scand.a-15146. Disponível em: https://journals.msp.org/mscand/article/view/551. Acesso em: 24 jul. 2026.