6. References

 
[1] B. Beneš, P. Felkel, J. Žára. Moderní počítačová grafika. Computer Press, 1998
[2] P. Bourke. http://www.mhri.edu.au/~pdb/modelling/implicitsurf/ Introduction to metaballs 
[3] F. Figueroa and A. Mahajan. A robust method to determine the coordinates of a wave source for 3d position sensing. ASME Journal of Dynamic Systems, Measurements and Control, Vol 116, pp. 505 511, 1994.
[4] F. Figueroa and A. Mahajan. An automatic self installation and calibration method for a 3d position sensing system using ultrasonics.ASME Journal of Dynamic Systems, Measurements and Control, 1996
[5] P. Heckbert, Graphics Gems IV,Academic Press, 1994.
[6] R. Herr and P. Slavík, Interaction in 3d space and 3d window manager, Selected Readings 1995 of the Computer Graphics Group, part II. Dept. of Computer Science and Engineering, Czech Technical University Prague, 1995
[7] P. Strážnický, Ultrazvukový detektor pohybu.,  Praktická Elektronika A Radio, 4:14,15, 1996.
[8] H.Wurnig, Design of a collaborative multi user desktop system for augmented reality. Proceedings of the CESCG '98, 1998.