Article on ACM Transactions on Interactive Intelligent Systems

The article "Integrated online localization and navigation for people with visual impairments using smart phones" by Ilias Apostolopoulos, Eelke Folmer, Navid Fallah, and Kostas Bekris has appeared on the latest issue of the ACM Transactions on Interactive Intelligent Systems (vol. 3, issue 4). More information about this paper, which corresponds to an extended version of a CHI 2012 paper can be found here:
http://www.pracsyslab.org/navatar_acm_tiis

You can also find the paper under the ACM Digital Library.