@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 },

}