Table: bulgarian_international_tennis
Columns: year
men_s_singles
men_s_doubles
women_s_doubles
mixed_doubles

Question: Which Men's singles has a Mixed doubles of kai abraham petra michalowsky?
SQL: SELECT "men_s_singles" FROM bulgarian_international_tennis WHERE "mixed_doubles" = 'kai abraham petra michalowsky'

Question: Which women's doubles has a Year of 1992?
SQL: SELECT "women_s_doubles" FROM bulgarian_international_tennis WHERE "year" = '1992'

Question: Which year has a Men's doubles of marcus ellis peter mills?
SQL: SELECT "year" FROM bulgarian_international_tennis WHERE "men_s_doubles" = 'marcus ellis peter mills'