1. Norman, D.A., Nielsen, J.: Gestural interfaces: A step backward in usability. Interactions 17(5), 46–49 (2010)
2. Brewster, S.A., Leplâtre, G., Crease, M.G.: Using non-speech sounds in mobile computing devices. In: Proceedings of the 1st Mobile HCI 1998, Glasgow, UK (1998)
3. Leplâtre, G., Brewster, S.A.: Designing non-speech sounds to support navigation in mobile phone menus. In: Proceedings of the 6th ICAD 2000, Atlanta, GA, USA (2000)
4. Palladino, D., Walker, B.N.: Efficiency of spearcon-enhanced navigation of one dimensional electronic menus. In: Proceedings of the ICAD 2008, Paris, France (2008)
5. Brewster, S.A., Cryer, P.G.: Maximising screen-space on mobile computing devices. In: Proceedings of the ACM CHI 1999, Pittsburgh, PA, USA (1999)