KOKLU, K.; ALBAYRAK, I.; BAYRAMOV, A. A regularized trace formula for second order differential operator equations. MATHEMATICA SCANDINAVICA, [S. l.], v. 107, n. 1, p. 123–138, 2010. DOI: 10.7146/math.scand.a-15146. Disponível em: https://www.mscand.dk/article/view/15146. Acesso em: 29 apr. 2024.