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- Schlup, J. 1987. Untersuchungen zur populationsdynamik von Ips typographus L. und zur Biologie seines haeufigsten Praedatoren Thanasimus formicarius L. Unpublished dissertation, University of Bern, Switzerland.
- Schlup, J. 1987. Untersuchungen zur Populationsdynamik von Ips typographus L. and zur Biologie seines haeufigsten Praedatoren Thanasimusformicarius L. Unpublished dissertation, University of Bern, Switzerland.
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