1. Birkett, M. D.;Gambino, M. J. T. 1989: Estimation of pulp kappa number with near-infrared spectroscopy. Tappi Journal 72 (9): 193–197
2. Easty, D. B.;Berben, S. A.;DeThomas, F. A.;Brimmer, P. J. 1990: Nearinfrared spectroscopy for the analysis of wood pulp: quantifying hardwood-softwood mixtures and estimating lignin content. Tappi Journal 73 (10): 257–261
3. Hoffmeyer, P. 1990: Failure of wood as influenced by mositure and duration of load. Doctoral dissertation. State University of N. Y., College of Environmental Sci. and Forestry, Syracuse.
4. Hoffmeyer, P. 1992: Evaluation of wood by near infrared reflectance spectroscopy. Proceedings of IUFRO-Timber Engineering meeting, Bordeaux and Nancy. Building Materials Laboratory. Technical University of Denmark
5. Kniest, C. 1992: Charakterisierung von Span-Leim-Gemischen mittels NIT-Spektroskopie. Holz Roh-Werkstoff 50: 73–78.