CREATE TABLE table_5873 ("city" TEXT, "area 1996 km\\u00b2" FLOAT, "area 2006 km\\u00b2" FLOAT, "pop. 1999" TEXT, "pop. 2003" TEXT, "pop. 2006" FLOAT)

Which area 2006 km has an area 1996 km of 26.39, and a pop 2006 smaller than 18,610?
SELECT MIN("area 2006 km\u00b2") FROM table_5873 WHERE "area 1996 km\u00b2" = '26.39' AND "pop. 2006" < '18,610'
SELECT MIN("area 2006 km\u00b2") FROM "table_5873" WHERE "area 1996 km\u00b2" = '26.39' AND "pop. 2006" < '18,610'