@inbook{ :87-98,
author = { } ,
title = { Providing interactive and user-adapted e-city services by means of voice portals },
booktitle = { Natural interaction with robots, knowbots and smartphones },
isbn = { 978-1-4614-8280-2 },
publisher = { Springer },
pages = { 87 - 98 },
year = { 2014 },
}