August 2002

y = (2 + cos(u+2pi/3)) cos(v+2pi/3)^{2} sin(v+2pi/3)^{2}

z = -(2 + cos(u-2pi/3)) cos(v+2pi/3)^{2} sin(v+2pi/3)^{2}

0 <= u <= 2 pi, 0 <= v <= 2 pi