The algorithm was introduced in the paper " ROAMing Terrain: Real-time Optimally Adapting Meshes" appearing in the Proceedings of IEEE Visualization 1997. The authors are
White, M. (2008). Real-Time Optimally Adapting Meshes: Terrain Visualization in Games. Retrieved from http://www.hindawi.com/journals/ijcgt/2008/753584/ ↩