Schaefer, M., Scheu, S. (1996): Animal-oriented ecosystem research - the importance of long-term studies. Verhandlungen der Deutschen Zoologischen Gesellschaft 89.2.: 189-203.
Schäfer, M.W. (1975): Reverse turns and the sense of direction in the orientation of Lithobius forficatus. Part 1 Demonstrating the sense of direction characterization of orientation ability. Behaviour, 55 (2): 15-41.
Schäfer, M.W. (1975): Reverse turns and the sense of direction in the orientation of Lithobius forficatus. Part 2 The external and internal points of reference. Behaviour, 55 (2): 42-72.
