The following publications are possibly variants of this publication:
- On balanced 4-holes in bichromatic point setsSergey Bereg, José Miguel Díaz-Báñez, Ruy Fabila Monroy, Pablo Pérez-Lantero, A. Ramírez-Vigueras, Toshinori Sakai, Jorge Urrutia, Inmaculada Ventura. comgeo, 48(3):169-179, 2015. [doi]
- Geometric Spanning Cycles in Bichromatic Point SetsBenson L. Joeris, Isabel Urrutia, Jorge Urrutia. gc, 31(2):453-465, 2015. [doi]