Do you have any copies of the articles? Much of it is (especially under the pine section), about mice. For examples, the figures were taken from
Odynets, A., O. Simonova, A. Kozhuhov, T. Saitsev, A. Verreva, L. Gnilomedova, and R. Rudzish. 1991. Beddings for laboratory animals: Criteria of Biological evaluation. Laboratornye Zhyvotnye 1:70-6.
Again, as I said it is older but I would be interested in reading newer articles contradicting this one.