Table: us_courts
Columns: region
citation
court_of_appeals
established
judges
meeting_places
chief_judge

Question: If the region is the Southern district of Texas, what is the citation?
SQL: SELECT "citation" FROM us_courts WHERE "region" = 'Southern District of Texas'

Question: If the chief judge is Jeffrey L. Viken, what is the region?
SQL: SELECT "region" FROM us_courts WHERE "chief_judge" = 'Jeffrey L. Viken'

Question: If the chief judge is Glen E. Conrad, what is the region?
SQL: SELECT "region" FROM us_courts WHERE "chief_judge" = 'Glen E. Conrad'