1. Erickson, H. D.: Some Aspects of Method in Determining Cellulose in Wood. TAPPI Vol. 45 (1962) p. 710/719.
2. McMillin, C. W.: Morphological Characteristics of Loblolly Pine Wood as Related to Specific Gravity, Growth Rate, and Distance from Pith. Wood Science and Technology Vol. 2 (1968) No. 3, p. 166/176.
3. Smith, D. M.: Method of Determining Specific Gravity of Wood Chips. U.S. For. Serv., For. Prod. Lab. Rep. No. 2209 (1961).