1. Bajpai, P., Pulp and Paper Industry. Energy Conversion, Elsevier, 2016, p.260.
2. Johan, G. and Fogelbolm, C.J., Papermaking Sciences and Technology, 6A Chemical Pulping, Finland: Tappi Press, 2000, p.41.
3. Geles, I.S., Drevesnoe syr’e, Strategicheskaya osnova i rezerv tsivilizatsii (Wood Raw Materials: The Strategic Basis and Reserve of Civilization), Petrazavodsk: Karel’skii Nauchnyi Tsentr RAN, 2007, p.499.
4. Nepenin, Yu.N., Tekhnologiya tsellyulozy. Proizvodstvo sul’fatnoi tsellyulozy (Technology of cellulose. Production of sulphate pulp), Moscow: Lesnaya Prom-st’, 1990.
5. Smook, G.A., Handbook for Pulp and Paper Technologists, Vancouver (Canada): Angus Wilde Publications, 2002, p.447.