INVARIANTE AND REDUCTION OF THE CLASS y¢ = F(x)yn , (n ¹ 0 ),UNDER STRETCHING GROUPS. ANJS [Internet]. 2008 Apr. 1 [cited 2024 Nov. 22];11(1):90-3. Available from: https://mail.anjs.edu.iq/index.php/anjs/article/view/1397