Alexandros Lazaridis Theodoros Kostoulas Iosif Mporas Todor Ganchev Nikos Katsaounos Stavros Ntalampiras Nikos Fakotakis Human evaluation of the LOGOS' spoken dialogue system. 36 2008 PETRA http://doi.acm.org/10.1145/1389586.1389629 conf/petra/2008 db/conf/petra/petra2008.html#LazaridisKMGKNF08