The curve is symmetric about the x-axis (y = 0) and self-intersects at y = 0, x = −a/8. Other intercepts are at the origin, at (a, 0) and with the y-axis at ±3⁄8√3a
^Christopher G. Morris. Academic Press Dictionary of Science and Technology. p. 381.
^David Darling (28 October 2004). The Universal Book of Mathematics: From Abracadabra to Zeno's Paradoxes. John Wiley and Sons. p. 62. ISBN9780471667001.
^C. G. Gibson (2001). Elementary Geometry of Differentiable Curves: An Undergraduate Introduction. Cambridge University Press. ISBN9780521011075.