Alvarez, V; Sakai, T; Urrutia, J
(2007)
Let P be a k colored point set in general position, k >= 2. A family of quadrilaterals with disjoint interiors Q(1) , . . . , Q(m) is called a quadrangulation of P if V(Q(1))U. . . UV(Q(m)) = P, the edges of all Q(i) join ...