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Rolla, Luigi; Fernandes, Lorenzo (1926). "Über das Element der Atomnummer 61". Zeitschrift für Anorganische und Allgemeine Chemie (in German). 157 (1): 371–381. Bibcode:1926ZAACh.157..371R. doi:10.1002/zaac.19261570129.
Rolla, Luigi; Fernandes, Lorenzo (1927). "Über Das Element der Atomnummer 61 (Florentium)". Zeitschrift für Anorganische und Allgemeine Chemie. 160 (1): 190–192. Bibcode:1927ZAACh.160..190R. doi:10.1002/zaac.19271600119.
Chung-Sin, Lee; Wang, Yun-Ming; Cheng, Wu-Long; Ting, Gann (1989). "Chemical study on the separation and purification of promethium-147". Journal of Radioanalytical and Nuclear Chemistry. 130 (1): 21–37. Bibcode:1989JRNC..130...21L. doi:10.1007/BF02037697. S2CID96599441.
Laing, Michael (2005). "A Revised Periodic Table: With the Lanthanides Repositioned". Foundations of Chemistry. 7 (3): 203–233. doi:10.1007/s10698-004-5959-9. S2CID97792365.
Chung-Sin, Lee; Wang, Yun-Ming; Cheng, Wu-Long; Ting, Gann (1989). "Chemical study on the separation and purification of promethium-147". Journal of Radioanalytical and Nuclear Chemistry. 130 (1): 21–37. Bibcode:1989JRNC..130...21L. doi:10.1007/BF02037697. S2CID96599441.