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@article{TUW-288355,
    author = {Karbon, Maria and Nothnagel, Axel},
    title = {Realization of a multifrequency celestial reference frame through a combination of normal equation systems},
    journal = {Astronomy {\&} Astrophysics},
    year = {2019},
    volume = {630},
    pages = {1--14},
    url = {https://www.aanda.org/articles/aa/pdf/2019/10/aa36083-19.pdf},
    doi = {10.1051/0004-6361/201936083},
    keywords = {Catalogs, Astrometry, Reference systems}
}