Meng Hu and Lili Wang, Application of He-s Amplitude Frequency Formulation for a Nonlinear Oscillator with Fractional Potential. journal = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 1213 - 1215 [viewed 18 April 2024]. Available from: https://publications.waset.org/pdf/14017.