References:Sjögren, H. (1895) Contributions to swedish mineralogy - 10. Retzian, a new arseniate from the Mossgrufva, Nordmark. Bull. Geol. Inst. Univ. Upsala 2, 54-59.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1027.
http://www.nrm.se/download/18.3f97929c114d50fdf8f80001363/Sj%C3%B6gren_Retzian_1895.pdf 26 entries listed. 24 valid minerals. 4 type localities (valid minerals).