1. Tangible bits
2. Synthesizing auditory icons
3. ARToolKit homepage on-line resource URL: http://www.hitl.washington.edu/artoolkit (retrieved 12/12/2004.) ARToolKit homepage on-line resource URL: http://www.hitl.washington.edu/artoolkit (retrieved 12/12/2004.)
4. M. Fernström L. Bannon E. Brazil: An investigation of soft-button widgets using sound. In: Le Journées de Design Sonore 2004. URL: http://richie.idc.ul.ie/eoin/research/fernstrom_et_al_jds04.pdf(retrieved 02/01/2005.) M. Fernström L. Bannon E. Brazil: An investigation of soft-button widgets using sound. In: Le Journées de Design Sonore 2004. URL: http://richie.idc.ul.ie/eoin/research/fernstrom_et_al_jds04.pdf(retrieved 02/01/2005.)