CREATE TABLE table_6914 ("Name" TEXT, "Novelty" TEXT, "Status" TEXT, "Authors" TEXT, "Unit" TEXT, "Location" TEXT)

Which authors have a Unit of densu -ciula formation?
SELECT "Authors" FROM table_6914 WHERE "Unit" = 'densuș-ciula formation'
SELECT "Authors" FROM "table_6914" WHERE "Unit" = 'densuș-ciula formation'