1. Y. Zhao, D. Baleanu, C. Cattani, D.F. Cheng, X.-J. Yang, Adv. High Energy Phys. 2013, 686371 (2013)
2. B.B. Mandelbrot, The Fractal Geometry of Nature (W. H. Freeman, New York, 1982)
3. K.G. Willson, Phys. Rev. 7, 2911 (1973)
4. C.G. Bollini, J.J. Giambiagi, Nuovo Cimento B 12, 26 (1972)
5. O.P. Agrawal, J. Math. Anal. Appl. 271, 368 (2002)