1. Aulin-Erdtman, G. 1953. Spectrographic contributions to lignin chemistry III. Investigations on model compounds. Svensk Papperstid 56: 91?101
2. Aulin-Erdtman, G.; Hegbom, L. 1957. Spectrographic contributions to lignin chemistry VII. The ultraviolet absorption and ionization ? ?-curves of some phenols. Svensk Papperstid. 60: 671?681
3. Bentum, A. L. K.; Côté Jr., W. A.; Day A. C.; Timell, T. E. 1969. Distribution of lignin in normal and tension wood. Wood Sci. Technol. 3: 318?331
4. Bland, D. E.; Ho, G.; Cohen, W. E. 1950. Aromatic aldehydes from the oxidation of some Australian woods and their chromatographic separation. Australian J. Sci. Res. 3 A: 642?648
5. Bland, D. E.; Scurfield, G. 1964. The chemistry of reaction wood, Part IV. The distribution and nature of the lignin in seedlings of hardwoods. Holzforschung 18: 161?166