Table: yugoslav_football_results_6
Columns: date
city
opponent
results
type_of_game

Question: On what Date were the Results¹ 4:0?
SQL: SELECT "date" FROM yugoslav_football_results_6 WHERE "results" = '4:0'

Question: On what Date were the Results¹ 5:1?
SQL: SELECT "date" FROM yugoslav_football_results_6 WHERE "results" = '5:1'

Question: On what Date were the Results¹ 4:0?
SQL: SELECT "date" FROM yugoslav_football_results_6 WHERE "results" = '4:0'