CREATE TABLE table_19664 ("Year" FLOAT, "Mens singles" CLOB, "Womens singles" CLOB, "Mens doubles" CLOB, "Womens doubles" CLOB, "Mixed doubles" CLOB)

Name the mens singles for jeliazko valkov dobrinka peneva
SELECT "Mens singles" FROM table_19664 WHERE "Mixed doubles" = 'Jeliazko Valkov Dobrinka Peneva'
SELECT "Mens singles" FROM "table_19664" WHERE "Mixed doubles" = 'Jeliazko Valkov Dobrinka Peneva'