QUINCEY, Paul; BROWN, Richard J. C. Implications of adopting plane angle as a base quantity in the SI. S. 998–1002. Metrologia [online]. 1. červen 2016. Svazek 53, čís. 3, s. 998–1002. Dostupné online. PDF [1]. ISSN1681-7575. DOI10.1088/0026-1394/53/3/998. (anglicky)
QUINCEY, Paul; BROWN, Richard J. C. Implications of adopting plane angle as a base quantity in the SI. S. 998–1002. Metrologia [online]. 1. červen 2016. Svazek 53, čís. 3, s. 998–1002. Dostupné online. PDF [1]. ISSN1681-7575. DOI10.1088/0026-1394/53/3/998. (anglicky)
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MOHR, Peter J.; PHILLIPS, William D. Dimensionless units in the SI. S. 991–997. Metrologia [online]. 2015 [cit. 2023-11-25]. Svazek 52, čís. 40, s. 991–997. Dostupné online.
QUINCEY, Paul; BROWN, Richard J. C. Implications of adopting plane angle as a base quantity in the SI. S. 998–1002. Metrologia [online]. 1. červen 2016. Svazek 53, čís. 3, s. 998–1002. Dostupné online. PDF [1]. ISSN1681-7575. DOI10.1088/0026-1394/53/3/998. (anglicky)
QUINCEY, Paul; BROWN, Richard J. C. Implications of adopting plane angle as a base quantity in the SI. S. 998–1002. Metrologia [online]. 1. červen 2016. Svazek 53, čís. 3, s. 998–1002. Dostupné online. PDF [1]. ISSN1681-7575. DOI10.1088/0026-1394/53/3/998. (anglicky)