1. Lect Notes Comput Sci;J. Burguet,2000
2. R.A. FINKEL, J.L. BENTLEY, Quad trees: A data structure for retrieval on composite keys, Acta Informatica, Vol. 4, pp. 1–9, 1974.
3. J.D. FOLEY, A. VAN DAM, S.K. FEINER, J.F. HUGHES, Computer Graphics: introduction and practice (second edition in C), Addison-Wesley.
4. R.A. GOLDSTEIN, R. NAGEL, 3-D Visual Simulation, Simulation, 16(1), pp. 25–31, 1971.
5. T. HENDERSON, C. HANSEN, CAD-Based Computer Vision, IEEE Transactions on Pattern Analysis and Machine Intelligence, 11(10), pp. 1181–1193, 1989.