Who describe Russian participation in the World War 1 was as forgotten war?

Russia's participation in WW1 is often flossed over by historians in general because they quit the war right in the middle of it (due to their Bolshevik Revolution); afterwards in which faster paced actions buried the Russian's participation into obscurity. Italy experienced the same thing; only a brief mentioning in the history books, because they quit WW2 right in the middle of it, in 1943.