Pedestrian navigation aids: information requirements and design implications. - Andrew J. May; Tracy Ross; Steven H. Bayer; Mikko Tarkiainen (Pers. Ubiquitous Comput., 2003)

A survey of 'young social' and 'professional' users of location-based services in the UK. - Andrew J. May; Steven H. Bayer; Tracy Ross (J. Locat. Based Serv., 2007)