STEFANOVSKI, J.; TRENCEVSKI, K.; COVACHEV, V. CAUCHY PROBLEM AND REDUCTION OF A SYSTEM OF PARTIAL DIFFERENTIAL EQUATIONS. Tamkang Journal of Mathematics, [S. l.], v. 30, n. 4, p. 315–329, 1999. DOI: 10.5556/j.tkjm.30.1999.4238. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4238. Acesso em: 26 sep. 2024.