Bakhtiar Mikhak Fred Martin Mitchel Resnick Robert Berg Brian Silverman The Children's Machines: Handheld and Wearable Computers Too. 31-43 http://dx.doi.org/10.1007/3-540-48157-5_5 1999 conf/huc/1999 HUC db/conf/huc/huc1999.html#MikhakMRBS99