Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_19662 ( "Year" real, "Mens singles" text, "Womens singles" text, "Mens doubles" text, "Womens doubles" text, "Mixed doubles" text )

### Question ###
Name the womens singles for raina tzvetkova petya nedelcheva

### Accurate SQL ###

SELECT "Womens singles" FROM table_19662 WHERE "Womens doubles" = 'Raina Tzvetkova Petya Nedelcheva'