  A tripartite-circle drawing of a tripartite graph is a drawing in the plane,
where each part of a vertex partition is placed on one of three disjoint
circles, and the edges do not cross the circles. We present upper and lower
bounds on the minimum number of crossings in tripartite-circle drawings of
$K_{m,n,p}$. In contrast to 1- and 2-circle drawings, which may attain the
Harary-Hill bound, our results imply that balanced restricted 3-circle drawings
of the complete graph are not optimal.
