which football referee has assistant referee at 2010 fifa world cup group d - srb ./. gha?
Entity Entity
m.0c0mf80 m.0c0mfdz
Ricardo Casas Hernan Maidana
class entity
soccer.football_referee m.0c0mdp8
soccer.football_referee soccer.football_match
Football Referee 2010 FIFA World Cup Group D - SRB ./. GHA
none none
soccer.football_referee.assistant_referee_at
Assistant referee at
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :soccer.football_referee . 
VALUES ?x1 { :m.0c0mdp8 } 
?x0 :soccer.football_referee.assistant_referee_at ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND soccer.football_referee (JOIN soccer.football_referee.assistant_referee_at m.0c0mdp8))