Zur Deutung verwickelter Spektren, insbesondere der Elemente Scandium bis Nickel by Friedrich Hund 2026-11-05
Original Zeitschrift für Physik 33, 345–371. Cited for classification of complex atomic spectra and term structure. Archival author-offprint record: www01.sub.uni-goettingen.de/fileadmin/media/texte/spezialsammlungen/Nachl%C3%A4sse/Hund.pdf
Only bibliographic/abstract access was available in this bounded inspection; the biography distinguishes modern spin-language statements of the rules from the historical formulation.