Danzmann, Karsten Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;
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Fee, M. S., Mills, A. P., Chu, S., Shaw, E. D., Danzmann, K., Chichester, R. J., et al. (1993). Measurement of the positronium 13S1-23S1 interval by continuous-wave two-photon excitation. Physical Review Letters, 70(10), 1397-1400. doi:10.1103/PhysRevLett.70.1397.