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- Otto, L.-F. 1999. Some results of the long term monitoring of bark beetles in the Ore Mountains. Pages 118-123 In B. Forster, M. Knízek, and W Grodzki (eds.), Methodology of forest insect and disease survey in Central Europe. Proceedings of the Second Workshop of the IUFRO Working Party 7.03.10, April 20-23, 1999, Sion-Châteauneuf, Switzerland. Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, Switzerland.
- Sousa, N., E. Marques, Correa, R. d. M., and G. Otto. 1997. Evaluation of the degree of infestation in stocked timber, in the municipality of Sao Mateus do Sul, Parana State (In Portuguese, with English summary). Revista do Setor de Ciencias Agrarias 16:63-68.