ASTRAUSKIENĖ, E.; RAGULSKIS, Liutauras; TIKNEVIČIENĖ, Irena. On the application of two small parameters method. Lietuvos matematikos rinkinys, [S. l.], v. 37, n. I, p. 236–240 , 1997. DOI: 10.15388/LMD.1997.38227. Disponível em: https://journals.vu.lt./LMR/article/view/38227. Acesso em: 19 apr. 2025.