“INVARIANTE AND REDUCTION OF THE CLASS y¢ = F(x)yn , (n ¹ 0 ),UNDER STRETCHING GROUPS” (2008) Al-Nahrain Journal of Science, 11(1), pp. 90–93. Available at: https://anjs.edu.iq/index.php/anjs/article/view/1397 (Accessed: 22 December 2024).