Who was the womens singles winnerwhen the mens doubles were  stefan karlsson claes nordin , bk aura gbk?
CREATE TABLE "table1_12266757_1" (
  "season" text,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text,
  "mixed_doubles" text
);
SELECT "womens_singles" FROM "table1_12266757_1" WHERE "mens_doubles"='Stefan Karlsson Claes Nordin , BK Aura GBK';