@ARTICLE{BDFHFHR02,
 AUTHOR        = {Bennett, Brandon and 
 Dixon, Clare and Fisher, Michael and Hustadt, Ullrich and
 Franconi, Enrico and Horrocks, Ian and 
 de Rijke, Maarten},
 TITLE         = {Combinations of Modal Logics},
 JOURNAL       = {AI Review},
 VOLUME        = {17},
 NUMBER        = {1},
 PAGES         = {1--20},
 MONTH         = mar,
 YEAR          = {2002},
}