YUJI, Yuji. Multiple positive solutions to mixed boundary value problems for singular ordinary differential equations on the whole line. Nonlinear Analysis: Modelling and Control, [S. l.], v. 17, n. 4, p. 460–480, 2012. DOI: 10.15388/NA.17.4.14051. Disponível em: https://www.journals.vu.lt/nonlinear-analysis/article/view/14051. Acesso em: 17 apr. 2025.