rows
     PREFIX smw:       
     PREFIX smwdt:     
     PREFIX relation:  
     PREFIX attribute: 
     PREFIX wikiurl:   
     PREFIX wiki:      
     PREFIX thing:     
     SELECT DISTINCT ?company
     WHERE { 
        ?company attribute:Sector ?sector . FILTER REGEX(str(?sector), "electronics") . 
        ?company attribute:Region ?region . FILTER(REGEX(str(?region), "netherlands")) . 
        ?company attribute:Exchange ?exchange .  FILTER(REGEX(str(?exchange), "euronext")) . 
     }
     ORDER BY ASC(?company)