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://test.zurnalai.vu.lt/LMR/article/view/38227. Acesso em: 27 oct. 2025.