CREATE TABLE table_39520 ("Source" CLOB, "Date" CLOB, "DeSUS" CLOB, "Zares" CLOB, "NLPD" CLOB)

What is the source corresponding to a date of May 25 27?
SELECT "Source" FROM table_39520 WHERE "Date" = 'may 25–27'
SELECT "Source" FROM "table_39520" WHERE "Date" = 'may 25–27'