WASET
    K. Jaroensutasinee,  Global Behavior in (Q-xy)2 Potential.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2007, vol. 9(9). 447 - 452
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/4111.