A. Auriol, Helix-type antenna and its manufacturing process European Patent, publication number: 0320404A1, 14 Juin, 1989.

D. K. Chew and S. R. Saunders, Meander line technique for size reduction of quadrifilar helix antenna, IEEE Antennas and wireless propagation letters, pp.109-111, 2002.
DOI : 10.1109/LAWP.2002.806051

Y. Letestu, A. Sharaiha, and P. Besnier, A size reduced configurations of printed quadrifilar helix antenna Antenna Technology: Small Antennas and Novel Metamaterials, pp.326-328, 2005.

N. Cohen, NEC 4 analysis of a fractalized monofilar helix in an axial mode, Conference proceedings, 14th Annual review of progress in Applied Computational Electromagnetics at the Naval Postgraduate School, 1998.

H. Jurgens, H. O. Peitgen, and D. Saupe, Chaos and Fractals: New Frontiers of Science, 1992.