Tejumola HO. Integral Conditions Of Existence And Non-Existence Of Periodic Solutions Of Some Sixth And Fifth Order Ordinary Differential Equations. JNMS [Internet]. 2021 Apr. 12 [cited 2024 Apr. 26];31(1-3):23-3. Available from: https://ojs.ictp.it/jnms/index.php/jnms/article/view/744