1. Lawrence, R., Ottaway, D.: (2002) [http://www.ligo.caltech.edu/docs/G/ G020502-00.pdf]
2. Hello, P., Vinet, J.-Y.: J. Phys. France 51, 1267 (1990)
3. Lawrence, R. (2003) [http://www.ligo.caltech.edu/docs/P/P030001-00.pdf]
4. Degallaix, J., Slagmolen, B., Zhao, C., Ju, L., Blair, D.: Gen. Rel. Grav. this issue (2005)
5. Hartmann, J.: Zf. Instrumentenk. 20, 4 (1900)