Khokarale S.G., Le-That T., Mikkola J.-P. Carbohydrate Free Lignin: A Dissolution-Recovery Cycle of Sodium Lignosulfonate in a Switchable Ionic Liquid System. 2016. ACS Sustainable Chemistry and Engineering. 4. 12. 7032-7040. 10.1021/acssuschemeng.6b01927.