Bicak, Jiri AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
Schmidt, Bernd G. Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
Bicak, J., & Schmidt, B. G. (2007). Helical symmetry in linear systems. Physical Review D, 76(10): 104040. Retrieved from http://link.aps.org/abstract/PRD/v76/e104040.