Question: Who was the womens singles winnerwhen the mens doubles were  stefan karlsson claes nordin , bk aura gbk?
Schema: create table table_12266757_1 (womens_singles varchar, mens_doubles varchar, PRIMARY KEY (womens_singles))
SQL: select womens_singles from table_12266757_1 where mens_doubles = "stefan karlsson claes nordin , bk aura gbk"