The following publications are possibly variants of this publication:
- Guarding curvilinear art galleries with vertex or point guardsMenelaos I. Karavelas, Csaba D. Tóth, Elias P. Tsigaridas. comgeo, 42(6-7):522-535, 2009. [doi]
- Guarding rectangular art galleriesJurek Czyzowicz, Eduardo Rivera-Campo, Nicola Santoro, Jorge Urrutia, Joseph Zaks. DAM, 50(2):149-157, 1994.