@article{NSR1995KU41, author="F. {Kurth} and T. {Gudjons} and B. {Hilbert} and T. {Reisinger} and G. {Werth} and A. -M. {Martensson-Pendrill}", title="Doppler Free ' Dark Resonances ' for Hyperfine Measurements and Isotope Shifts in Ca$^{+}$ Isotopes in a Paul Trap", journal="Z.Phys.", year=1995, volume="D34", pages="227" }
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