CREATE TABLE table_204_843 (id DECIMAL, "volume" DECIMAL, "year" TEXT, "names" TEXT, "articles" DECIMAL, "pages" DECIMAL, "images" DECIMAL, "maps" DECIMAL, "number of copies" DECIMAL)

what is the total of articles for this chart
SELECT SUM("articles") FROM table_204_843
SELECT SUM("articles") FROM "table_204_843"