Unidentified Interstellar Lines in the Yellow and Red

Paul W. Merrill, O. C. Wilson · The Astrophysical Journal · 1938

Scanner Observations of λ 4430

E. J. Wampler · The Astrophysical Journal · 1966

New Members of the Association VI Cygni. II.

D. H. Schulte · The Astrophysical Journal · 1958

Image Tube Observations of the λ4430 Interstellar Band

Mary Brück, K. Nandy · Nature · 1968

Astronomical Image AnalysisPhotometryImage Tube Observations+1

A Very Red Star of Early Type in Cygnus

W. W. Morgan, H. L. Johnson, N. G. Roman · Publications of the Astronomical Society of the Pacific · 1954

Red StarPhotometryStellar Structure+1