On the Butterfly Catastrophe Model and Stability of Finite Periodic Solutions for Some Non-Linear Differential Equations
Maǧallaẗ ǧāmiʻaẗ kirkūk. Al-dirāsāt al-ʻilmiyyaẗ/Mağallaẗ ğāmiʿaẗ Kirkūk. Al-dirāsāt al-ʿilmiyyaẗ