Media type: E-Article Title: Forbidden Lines in Astrophysical Sources Contributor: Boyce, Joseph C.; Menzel, Donald H.; Payne, Cecilia H. Published: Proceedings of the National Academy of Sciences, 1933 Published in: Proceedings of the National Academy of Sciences, 19 (1933) 6, Seite 581-591 Language: English DOI: 10.1073/pnas.19.6.581 ISSN: 1091-6490; 0027-8424 Origination: Footnote: Access State: Open Access