Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Hemicellulose:

"

In the sulfite pulp process, hemicellulose is largely hydrolysed by the acid pulping liquor ending up in the brown liquor where the fermentable hexose sugars (around 2%) can be used for producing ethanol. This process was primarily applied to calcium sulfite brown liquors.[citation needed]